96 Fun Facts About Climate Change

Which greenhouse gas is the most abundant in Earth's atmosphere by average mole fraction?

Water vapor averages a few tenths of a percent of the atmosphere, roughly ten times CO2's 0.04%, but its level is set by temperature rather than emissions, so it amplifies warming instead of driving it.

Which 1997 treaty committed industrialized countries to reduce greenhouse gas emissions?

The Kyoto Protocol was an international agreement adopted in 1997, legally binding developed countries to emission reduction targets. It represented a significant step in international climate policy.

At which Hawaiian observatory has CO2 been measured continuously since 1958, producing the Keeling Curve?

Charles David Keeling began the measurements at Mauna Loa in 1958; on 9 May 2013 the observatory's daily mean CO2 passed 400 parts per million for the first time.

What is the largest human activity contributing to rising atmospheric carbon dioxide levels?

The combustion of fossil fuels (coal, oil, and natural gas) for energy, transportation, and industrial processes is the predominant human activity leading to increased carbon dioxide in the atmosphere.

What natural process has atmospheric gases trap heat and warm Earth's surface?

The greenhouse effect was measured in the laboratory by John Tyndall in 1859; Swedish meteorologist Nils Gustaf Ekholm attached the greenhouse name to it in 1901, decades after the physics had been worked out.

Which potent greenhouse gas persists in the atmosphere for only about 12 years?

Methane is a potent greenhouse gas with a global warming potential significantly higher than CO2 over a 100-year period, but it has a much shorter atmospheric lifetime of about 12 years compared to CO2's much longer persistence.

Which scientist showed in an 1856 paper that CO2 absorbs heat and could alter climate?

Eunice Newton Foote's 1856 paper found that a glass cylinder filled with carbon dioxide heated far more in sunlight than one of ordinary air, three years before John Tyndall's better-known experiments.

Which scientist first quantitatively predicted, in 1896, the warming from doubling atmospheric CO2?

Svante Arrhenius's 1896 paper calculated that doubling atmospheric CO2 would warm the Earth by roughly 5–6 °C, a prospect the Swedish chemist regarded as broadly benign.

Melting glaciers and polar ice sheets directly contribute to which significant environmental consequence?

As land-based glaciers and ice sheets melt due to rising global temperatures, the water flows into the oceans, directly increasing global sea levels.

What do scientists call the ocean's chemical shift caused by absorbing excess carbon dioxide?

Ocean acidification: between 1950 and 2020 the average surface pH fell from about 8.15 to 8.05, roughly a 26% rise in hydrogen ion concentration, as seawater absorbed excess CO2.

Which climate policy sets a fixed ceiling on emissions and lets firms exchange permits?

Cap and trade is an emissions trading system that sets a maximum limit on total emissions and allows companies to trade emission allowances, creating a financial incentive to reduce pollution.

Besides raising sea levels, what other major impact does warmer seawater have on marine ecosystems?

Rising ocean temperatures can cause coral bleaching, a phenomenon where corals expel vital algae, leading to their whitening and often death, which severely impacts biodiversity and marine habitats.

What term, also called decarbonisation, describes action to limit the greenhouse gases in the atmosphere?

Climate Mitigation, or decarbonisation, cuts greenhouse gas emissions at their origin or boosts the sinks that absorb them, lessening future warming.

What term describes ground frozen for at least two consecutive years, which releases carbon as it thaws?

Permafrost is ground that stays at or below 0 °C for at least two consecutive years; the oldest known permafrost has been frozen around 700,000 years, and thawing lets microbes release carbon locked up since the ice ages.

Which feedback loop amplifies warming as bright frozen surfaces give way to darker land and water?

Ice-albedo feedback: fresh snow reflects up to about 90% of incoming sunlight while open ocean absorbs over 90%, so each patch of lost sea ice lets more solar energy warm the surface.

Which process in the carbon cycle has plants absorb CO2 to create organic compounds?

Photosynthesis is the process by which green plants and other organisms use sunlight to synthesize foods from carbon dioxide and water, playing a crucial role in removing CO2 from the atmosphere as part of the carbon cycle.

What umbrella term covers heatwaves, droughts and heavy rainfall intensifying as the planet warms?

A key impact of climate change is the increasing occurrence and severity of extreme weather events, including prolonged heatwaves, more intense droughts, heavier rainfall, and stronger storms, affecting regions worldwide.

What is the term for capturing atmospheric carbon dioxide and storing it long-term in forests, soils or rock?

Carbon Sequestration is the capture and storage of atmospheric carbon dioxide, in forests, soils or underground geological formations, to blunt climate change.

Which 2015 accord, adopted at COP21, aims to keep global warming well below 2 °C above pre-industrial levels?

The Paris Agreement's long-term goal is to hold the rise in global surface temperature well below 2 °C, with efforts to limit it to 1.5 °C; it was adopted in December 2015.

Which synthetic gas has a 100-year warming potential roughly 23,500 times that of carbon dioxide?

Sulfur hexafluoride (SF6), used as an insulator in high-voltage switchgear, was assigned a 100-year warming potential of 23,500 in the IPCC's Fifth Assessment Report and lingers for roughly 3,200 years.

Which two United Nations bodies set up the Intergovernmental Panel on Climate Change in 1988?

Its first chair, Bert Bolin, was elected the same year, and the panel shared the 2007 Nobel Peace Prize with Al Gore.

What collective name is given to atmospheric constituents that absorb and emit the infrared Earth radiates?

Greenhouse gases such as water vapor, carbon dioxide and methane absorb and re-emit infrared; nitrogen and oxygen, 99% of dry air, are transparent to it, so these trace constituents do the heat-trapping.

Which nation has released the most cumulative carbon dioxide since the Industrial Revolution?

The United States has emitted roughly a quarter of all fossil-fuel CO2 since 1850, more than any other nation; China overtook the US in annual emissions only around 2006.

What term is a calculated index of the total greenhouse gas emissions an activity, product or country adds?

A carbon footprint totals the greenhouse gases attributable to an activity, product or country, expressed in tonnes of CO2-equivalent so that methane and nitrous oxide count alongside carbon dioxide.

What is a structure whose annual power use is matched by renewable generation on-site or procured off-site called?

A zero-energy building generates as much renewable energy over a year as it consumes; the EU's Energy Performance of Buildings Directive has required new buildings to meet a related 'nearly zero-energy' standard since 2021.

Which process in living cells oxidises carbohydrates back to carbon dioxide, the reverse of photosynthesis?

Cellular respiration oxidises glucose to carbon dioxide and water to release energy as ATP; photosynthesis captures roughly 130 terawatts globally, and respiration by plants, animals and microbes returns most of that carbon to the air.

Which scientist's June 1988 Senate testimony raised broad public awareness of global warming?

James Hansen, then director of NASA's Goddard Institute for Space Studies, told a Senate committee on 23 June 1988 that he was 99 percent confident the warming trend was real and tied it to the greenhouse effect.

What are the numerical simulations coupling atmosphere, ocean, land and ice to project Earth's future called?

Climate Models are mathematical simulations of the drivers of climate; modern ones are often called earth system models because they add the carbon cycle and vegetation to the physics.

What technology captures CO2 from a point source and injects it into deep geological formations?

Carbon capture and storage (CCS) scrubs CO2 from flue gas at power plants or factories and injects it underground; Norway's Sleipner field has stored about a million tonnes a year in a saline aquifer since 1996.

The IPCC's Sixth Assessment Report found that half of all species with long-term data had shifted their ranges in which direction?

Poleward: the IPCC's 2022 Working Group II report found roughly half of species with long-term records have shifted toward the poles, or upslope on mountains, across insects, birds, fish and plants alike.

What term describes adjusting to a warming world's effects, rather than trying to prevent them?

Climate adaptation involves implementing strategies and measures to reduce vulnerability and build resilience to the unavoidable impacts of climate change, such as rising sea levels, extreme weather, and changes in agricultural patterns.

What concept holds that warming hits vulnerable populations hardest and calls for equitable responsibility?

Climate justice is a framework recognizing that climate change disproportionately affects vulnerable communities who have contributed least to the problem, advocating for fair distribution of both the burdens and benefits of climate action.

Which farming approach aims to restore degraded soils, boost biodiversity and store carbon?

Regenerative agriculture employs practices like cover cropping, no-till farming, and diverse rotations to improve soil health, increase biodiversity, and enhance the soil's capacity to draw down and store atmospheric carbon, thus mitigating climate change.

What financial instrument specifically funds projects with environmental or climate benefits?

Green bonds are a category of fixed-income securities that enable capital raising for projects that deliver environmental benefits, such as renewable energy installations, sustainable waste management, or green buildings.

Which third-ranked greenhouse gas has a lifetime of about 109 years and a GWP of 273?

Nitrous oxide (N2O) is the third most important long-lived greenhouse gas after CO2 and methane; most emissions come from denitrification in the nitrogen cycle, boosted by fertilised farmland.

What term describes changes in the timing of seasonal events like flowering or migration due to climate change?

Phenological shifts refer to the observed changes in the timing of recurring biological events in plant and animal life cycles, such as earlier flowering or altered migration patterns, largely driven by a warming climate.

Roughly what fraction of humanity's carbon dioxide emissions has the ocean absorbed?

The ocean has taken up about a quarter of human CO2 emissions, roughly 2.5 billion tonnes of carbon a year, which drives the steady fall in surface seawater pH.

What phenomenon makes built-up city centres significantly warmer than the surrounding countryside?

The Urban Heat Island effect was first reported by Luke Howard, who found central London about 2.1 °C warmer at night than the countryside around it.

For the 10,000 years before the mid-18th century, atmospheric CO2 stayed at roughly what level?

About 280 ppm held through the 10,000 years to the mid-1700s; ice cores show the level stayed between 180 and 280 ppm for 800,000 years, until the rise of the last 250 years.

What term refers to the fraction of solar radiation a surface reflects back into space?

Albedo quantifies the reflectivity of a surface, indicating the percentage of incoming solar radiation that is reflected back into space. Surfaces like snow and ice have high albedo, while oceans and forests have low albedo.

Which 1987 treaty phasing out ozone-depleting substances has been ratified by every country?

The Montreal Protocol, signed in 1987, phased out CFCs and reached universal ratification in 2009; its 2016 Kigali Amendment extended it to hydrofluorocarbons, refrigerant gases with a strong warming effect of their own.

What is the goal where heat-trapping gases from human activity are balanced by removals called?

Net-zero emissions means human-caused greenhouse gas emissions are balanced by removals such as new forests or engineered capture; the Paris Agreement calls for that balance in the second half of this century.

In climate science, what term describes a critical threshold that, once crossed, leads to large, accelerating and often irreversible change?

A Climate Tipping Point is a threshold beyond which change becomes large, accelerating and often irreversible, such as the collapse of major ice sheets.

What is planting a new forest on land not forested for a significant period called?

Afforestation establishes forest on land that had none for a long time, such as grassland; reforestation, by contrast, re-establishes forest on land recently cut down or lost to fire or storms.

What is the degradation of productive dryland into barren, unproductive terrain called?

Desertification is a severe form of land degradation where fertile land transforms into arid or desert-like conditions, primarily driven by climate change and unsustainable human land management practices.

Which 1992 treaty, opened for signature at the Rio Earth Summit, frames global greenhouse gas talks?

The UN Framework Convention on Climate Change (UNFCCC), signed at Rio in 1992, entered into force in 1994; its first Conference of the Parties met in Berlin in 1995, and the Kyoto and Paris agreements sit under it.

What natural process breaks down dead organic matter, releasing CO2, and speeds up in warmth?

Decomposition by microbes and fungi returns carbon from dead matter to the air as CO2; it accelerates in warmth, one reason thawing northern soils are giving up carbon stored for millennia.

Which French mathematician first proposed in the 1820s that the atmosphere acts as an insulator?

Joseph Fourier argued in 1824 and 1827 that the atmosphere lets sunlight in but slows the escape of heat; he never used the greenhouse label and wrongly assumed interstellar radiation supplied much of the missing warmth.

Which English steam engineer showed in 1938 that Earth's land temperature had risen over 50 years?

Guy Stewart Callendar, a steam engineer and amateur climatologist, compiled decades of weather-station records in 1938 to show land temperatures had risen over 50 years; he put climate sensitivity at 2 °C and welcomed the warming as delaying the glaciers.

What sporting nickname was given to the 1999 Mann, Bradley and Hughes temperature graph?

The 'hockey stick' graph: its long flat shaft is centuries of slow cooling and its blade the sharp 20th-century upturn; more than two dozen later reconstructions reproduced the shape.

Emails hacked from which university's Climatic Research Unit sparked 'Climategate' in 2009?

The University of East Anglia's Climatic Research Unit was the target; Norfolk Police closed the investigation in 2012 without identifying the attacker, and multiple inquiries cleared the scientists of manipulating data.

Which 2006 documentary built around Al Gore's climate slide show won the Oscar for Best Documentary Feature?

An Inconvenient Truth opened on just four screens on Memorial Day weekend 2006 and took a record $91,447 per theater for a documentary; it also won Best Original Song.

Outside which building did Greta Thunberg begin her school strike in August 2018?

Thunberg sat outside the Riksdag, Sweden's parliament, from 20 August 2018, intending to strike only until the general election three weeks later, after Sweden's hottest summer in at least 262 years.

The 2021 Glasgow Climate Pact was the first COP deal to explicitly commit to reducing which fuel?

The Glasgow pact pledged to 'phase down' unabated coal power, the first explicit mention of coal in a COP decision; late interventions from India and China softened the wording from 'phase out'.

COP28 in 2023, the first to call for a shift away from all fossil fuels, was held in which city?

COP28 met at Expo City Dubai in December 2023 and agreed to 'transition away from fossil fuels'; its president, Sultan Al Jaber, was simultaneously chief executive of the Abu Dhabi National Oil Company.

Which fund for climate-vulnerable countries was agreed for the first time at COP27 in Egypt?

COP27 at Sharm El Sheikh in November 2022 agreed to create a loss and damage fund for countries hit by climate impacts; the fund was made operational on the opening day of COP28 a year later.

The US withdrawal from the Paris climate accord took effect the day after which 2020 event?

The United States' exit took effect on 4 November 2020, the day after the presidential election: Paris rules barred any withdrawal notice until three years after entry into force and then imposed a one-year wait.

Which 2022 US law made the largest investment against greenhouse gas emissions in American history?

The Inflation Reduction Act, signed in August 2022, authorised $391 billion for energy and climate out of $891 billion in total spending, the slimmed-down survivor of the Build Back Better plan.

Ursula von der Leyen called which EU plan Europe's 'man on the moon moment'?

Von der Leyen used the phrase when unveiling the European Green Deal on 11 December 2019; Poland secured an exemption from the 2050 climate-neutrality commitment when the European Council backed the plan days later.

Which economist led the 700-page 2006 review of climate change economics for the UK government?

Nicholas Stern, then head of the UK Government Economic Service, led the Stern Review published in October 2006; Gordon Brown commissioned it as Chancellor in 2005 and a team of Treasury economists wrote it.

In which South Korean city did the IPCC approve its 2018 special report on 1.5 °C of warming?

The IPCC approved the 1.5 °C report at its session in Incheon on 6 October 2018; 91 authors from 40 countries drew on more than 6,000 references to conclude the target needed 'unprecedented changes in all aspects of society'.

What best estimate did the IPCC's Sixth Assessment give for warming from a doubling of CO2?

AR6 put the best estimate of equilibrium climate sensitivity at 3 °C, with a likely range of 2.5–4 °C; the transient response is lower because the deep ocean takes centuries to catch up.

The change in Earth's energy balance caused by CO2 or aerosols is measured in which unit?

Radiative forcing is expressed in watts per square metre; the IPCC's Sixth Assessment put total human-caused forcing at 2.72 W/m² in 2019 relative to 1750, with aerosol cooling partly offsetting the gases.

Orbital cycles that pace the ice ages are named after a geophysicist of which nationality?

Milutin Milanković, a Serbian geophysicist, refined James Croll's earlier idea in the 1920s that eccentricity, tilt and precession together reshape the sunlight reaching Earth.

The Paleocene–Eocene Thermal Maximum warming event occurred roughly how many million years ago?

The PETM began about 56 million years ago: global temperatures jumped 5–8 °C within a few thousand years and stayed high for roughly 200,000 years, with a massive carbon release the likely cause.

Syukuro Manabe shared the 2021 Nobel Prize in Physics for climate modelling with Parisi and whom?

Klaus Hasselmann of the Max Planck Institute for Meteorology shared half the prize with Manabe for physical modelling of Earth's climate; Manabe pioneered computer climate simulation in the 1960s and received Japan's Order of Culture the same year.

The 2002 collapse of Antarctica's Larsen B ice shelf lost an area comparable to which US state?

Some 3,250 km² of ice 220 m thick, about the area of Rhode Island, broke up in roughly five weeks in early 2002; the Crane Glacier behind it sped up threefold once its buttress was gone.

Which Antarctic glacier, larger than Florida, has been nicknamed the 'Doomsday Glacier'?

Thwaites Glacier in West Antarctica is about 120 km across, the widest on Earth, and holds enough ice to raise global sea level by around 65 cm, with more to follow if it destabilises its neighbours.

Roughly how much would global sea levels rise if the entire Greenland ice sheet melted?

Greenland holds enough ice to raise global sea level by about 7.4 m; warming of roughly 1.7–2.3 °C would likely make that melt inevitable, though finishing it would take around 10,000 years.

Which country's president held the world's first underwater cabinet meeting in October 2009?

Maldives president Mohamed Nasheed and his ministers signed documents in scuba gear off Girifushi on 17 October 2009, a month before he founded the Climate Vulnerable Forum.

Tuvalu's foreign minister Simon Kofe recorded his 2021 COP26 speech standing where?

Kofe delivered the address knee-deep in seawater off Funafuti to show his nation sinking; a year later he announced Tuvalu would recreate itself in the metaverse so its land, ocean and culture survive whatever happens physically.

The April 1815 eruption of which volcano caused 1816's 'Year Without a Summer'?

Mount Tambora on Sumbawa, Indonesia, erupted in April 1815 in the largest eruption in recorded history; global temperatures dropped 0.4–0.7 °C and Europe's 1816 summer was the coldest recorded between 1766 and 2000.

How many heat-related deaths did France record during the 2003 European heat wave?

France recorded 14,802 heat-related deaths in the first three weeks of August 2003; Auxerre logged eight straight days above 40 °C and nights stayed so hot that stone houses never cooled.

Above what sustained wet-bulb temperature is heat likely fatal even to fit people resting in shade?

A sustained wet-bulb temperature of 35 °C is the point where the body can no longer shed heat by sweating; the deadly 2003 and 2010 European heat waves never exceeded 28 °C on this scale.

The Bramble Cay melomys, the first mammal lost to man-made climate change, was what kind of animal?

The melomys was a rodent, a mosaic-tailed rat whose only home was Bramble Cay, a tiny coral cay at the northern tip of the Great Barrier Reef, repeatedly swamped by rising seas until the last sighting in 2009.

The golden toad, last seen in 1989, lived in the cloud forest above Monteverde in which country?

Monteverde's cloud forest is in Costa Rica; the golden toad's entire range covered about four square kilometres there, and the final sighting was a solitary male spotted by Martha Crump on 15 May 1989.

In which year did the EU Emissions Trading System, the bloc's carbon market, begin operating?

The EU Emissions Trading System launched on 1 January 2005 as the world's first major carbon market; over-allocation of free allowances in its pilot phase crashed the price to near zero by 2007.

The UK's Climate Change Act 2008 originally mandated what cut in emissions by 2050?

The Act set a legally binding 80% cut from 1990 levels by 2050; the draft bill had proposed 60% before Ed Miliband raised it, and in June 2019 the target was strengthened to a full 100% (net zero).

The landmark Urgenda climate case was brought against the government of which country?

The Urgenda Foundation sued the Netherlands in 2013 on behalf of 886 citizens; the Dutch Supreme Court upheld the ruling in 2019, forcing a 25% cut from 1990 levels by the end of 2020 on human-rights grounds.

Climeworks' Orca plant, which pulls CO2 from the air and stores it in rock, opened in 2021 where?

Its name comes from 'orka', the Icelandic word for energy, and it sits beside the Hellisheiði geothermal power station near Reykjavík.

Peatlands hold up to 550 gigatonnes of carbon while covering what share of the land surface?

Peatlands cover only about 3% of the land surface yet hold up to 550 gigatonnes of carbon, 42% of all soil carbon and more than every forest on Earth combined, accumulating at roughly a millimetre a year.

The cement industry creates up to what share of worldwide man-made CO2 emissions?

Cement accounts for up to 8% of global CO2 emissions; about half comes from the chemistry itself, since heating limestone to make clinker releases CO2 regardless of what fuel fires the kiln.

Global commercial aviation generated what share of all CO2 emissions in 2018?

Commercial aviation emitted 918 million tonnes of CO2 in 2018, 2.4% of the global total, with passengers responsible for 747 million tonnes and freight for 171 million.

What is the digestive process by which cattle produce the heat-trapping gas they belch called?

Enteric fermentation by the rumen's microbes, over 200 species of them, produces the methane cattle belch, a loss of 2–12% of the animal's gross energy intake.

Who led the team whose 1985 Nature paper first reported the Antarctic ozone hole?

Joe Farman, with Brian Gardiner and Jonathan Shanklin of the British Antarctic Survey, published the finding in Nature in May 1985; models had predicted only gradual thinning, so a large springtime loss over Antarctica came as a shock.

Which engineer developed both leaded gasoline and the first CFCs, sold under the name Freon?

Thomas Midgley Jr. developed tetraethyl lead for General Motors in 1921 and the first CFC refrigerant, Freon, in 1928; he held more than 100 patents and suffered lead poisoning himself while publicly insisting the additive was safe.

The Senate’s 1997 Byrd–Hagel Resolution on climate treaties passed by what vote?

Sponsored by Robert Byrd and Chuck Hagel, it meant the Clinton administration signed the Japan-brokered treaty a year later but never sent it for ratification.

Which country in 2011 became the first to announce its withdrawal from the 1997 emissions treaty?

Canada's environment minister Peter Kent announced the withdrawal on 12 December 2011, saying staying in would have cost $14 billion in penalties; the exit took effect in December 2012.

Which scientist popularized the term 'global warming' with the title of a 1975 paper?

Wallace Broecker's 1975 Science paper asked 'Are We on the Brink of a Pronounced Global Warming?'; the phrase had appeared once before, in a 1957 newspaper report on Roger Revelle's research, and Broecker also coined the ocean 'conveyor belt' idea.

The 2004 film The Day After Tomorrow depicts a new ice age triggered by the disruption of what?

Roland Emmerich adapted it from The Coming Global Superstorm, a 1999 book by radio host Art Bell and Whitley Strieber.

In 2020 which country became the first where all-electric cars outsold all combustion-engine cars?

Norway: battery-electric cars took 54% of its new-car market in 2020, the first time they beat every other type combined, and reached 88.9% in 2024, helped by tax breaks that petrol and diesel models never got.

Which sinking city did Indonesia choose to replace with Nusantara, a new capital on Borneo?

Jakarta is sinking up to 25 cm a year in places as groundwater is pumped out; Indonesia celebrated Independence Day in the half-built Nusantara for the first time on 17 August 2024.

MOSE, a mobile flood barrier first raised against a high tide in 2020, protects which city?

MOSE's 78 gates across the three inlets of the Venetian Lagoon were first raised on 3 October 2020 and kept Venice's St Mark's Square dry; the system had been expected to operate only a few times a year.

Peruvian fishermen named the warm Pacific current El Niño after whom, as it peaked near Christmas?

El Niño means 'the boy' and refers to the Christ Child, because the warm current peaked around Christmas; its cool counterpart La Niña was once called El Viejo, 'the old man'.

Which country is carbon negative thanks to forests covering about 72% of its land?

Bhutan's constitution requires at least 60% forest cover; its forests, covering about 72% of the land, absorb more than twice the country's annual CO2 emissions, which makes it carbon negative.

Which two Democrats presented the Green New Deal resolution to Congress in February 2019?

Green Party candidate Howie Hawkins had run on a Green New Deal platform for New York governor back in 2010.