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The IPCC lead authors are experts in their field, instructed to fairly represent the full range of the up-to-date, peer-reviewed literature.
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fact
human
climate
Increased CO2 makes more water vapor, a greenhouse gas which amplifies warming
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fact
human
climate
Water vapour is the most dominant greenhouse gas.
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fact
human
climate
“A leading Canadian authority on polar bears, Mitch Taylor, said: ‘We’re seeing an increase in bears that’s really unprecedented, and in places where we’re seeing a decrease in the population
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fact
human
climate
The costs of inaction far outweigh the costs of mitigation.
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fact
human
climate
Greenland on the whole is losing ice, as confirmed by multiple satellite and on the ground field measurements.
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fact
human
climate
While the Greenland interior is in mass balance, the coastlines are losing ice.
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fact
human
climate
Overall Greenland is losing ice mass at an accelerating rate.
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fact
human
climate
While there are direct ways in which CO2 is a pollutant (acidification of the ocean), its primary impact is its greenhouse warming effect.
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fact
human
climate
While the greenhouse effect is a natural occurence, too much warming has severe negative impacts on agriculture, health and environment.
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fact
human
climate
Although it has some very important and beneficial effects, CO2 meets the legal and encyclopedic definitions of a "pollutant", and human CO2 emissions pose a threat to public health and welfare.
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fact
human
climate
This growth stimulation occurs because CO2 is one of the two raw materials (the other being water) that are required for photosynthesis.
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fact
human
climate
Less energy is escaping to space: Carbon dioxide (CO2) acts like a blanket; adding more CO2 makes the 'blanket' thicker, and humans are adding more CO2 all the time.
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fact
human
climate
Satellite and surface measurements find less energy is escaping to space at CO2 absorption wavelengths.
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fact
human
climate
The sun has shown no long term trend since 1950 and in fact has shown a slight cooling trend in recent decades.
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fact
human
climate
Arctic sea ice has been steadily thinning, even in the last few years while the surface ice (eg - sea ice extent) increased slightly.
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fact
human
climate
By that time CO2 emissions had already risen from the expanded use of coal that had powered the industrial revolution, and emissions only increased slowly from 3.5gigatonnes in 1910 to under 4gigatonnes by the end of the Second World War.
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fact
human
climate
Even during a period of long term warming, there are short periods of cooling due to climate variability.
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fact
human
climate
Short term cooling over the last few years is largely due to a strong La Nina phase in the Pacific Ocean and a prolonged solar minimum.
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fact
human
climate
The IPCC blames human emissions of carbon dioxide for the last warming.
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fact
human
climate
Greenhouse gases have been the main contributor of warming since 1970.
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fact
human
climate
Furthermore, it is physically incorrect to state that the planet is simply "recovering" from the Little Ice Age.
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fact
human
climate
There are a number of forcings which affect climate (eg - stratospheric aerosols, solar variations).
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fact
human
climate
The main reason behind this mid-century cooling was global dimming due to anthropogenic sulfate aerosol emissions.
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fact
human
climate
Early 20th century warming was in large part due to rising solar activity and relatively quiet volcanic activity.
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fact
human
climate
Volcanoes have been relatively frequent and if anything, have exerted a cooling effect.
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fact
human
climate
Warming trends agree well with surface temperatures and model predictions except near the Poles.
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fact
human
climate
The global dimming trend reversed around 1990 - 15 years after the global warming trend began in the mid 1970's.
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fact
human
climate
(Kerr 2007) points out that the sunlight-reflecting haze that cools much of the planet seems to have thinned over the past decade or so.
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fact
human
climate
A natural cycle requires a forcing, and no known forcing exists that fits the fingerprints of observed warming - except anthropogenic greenhouse gases.
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fact
human
climate
The El Nino Southern Oscillation shows close correlation to global temperatures over the short term.
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fact
human
climate
Mount Kilimanjaro's shrinking glacier is complicated and not due to just global warming.
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fact
human
climate
'Gore claims the snowcap atop Africa's Mt. Kilimanjaro is shrinking and that global warming is to blame.
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fact
human
climate
Believers think the warming is man-made, while the skeptics believe the warming is natural and contributions from man are minimal and certainly not potentially catastrophic à la Al Gore.'
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fact
human
climate
The human fingerprint in global warming is evident in multiple lines of empirical evidence - in satellite measurements of outgoing infrared radiation, in surface measurements of downward infrared radiation, in the cooling stratosphere and other metrics.
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fact
human
climate
Fundamental physics and global climate models both make testable predictions as to how the global climate should change in response to anthropogenic warming.
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fact
human
climate
The IPCC confirms that computer modeling predicts the existence of a tropical, mid-troposphere “hot spot” about 10km above the Earth’s surface.
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fact
human
climate
"The Pacific Decadal Oscillation (PDO) is a temperature pattern in the Pacific Ocean that spends roughly 20-30 years in the cool phase or the warm phase.
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fact
human
climate
In 1946, PDO switched to a cool phase.
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fact
human
climate
In 1977, PDO switched to a warm phase.
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fact
human
climate
The atmosphere of the Earth is less able to absorb shortwave radiation from the Sun than thermal radiation coming from the surface.
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fact
human
climate
The effect of this disparity is that thermal radiation escaping to space comes mostly from the cold upper atmosphere, while the surface is maintained at a substantially warmer temperature.
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fact
human
climate
This is called the "atmospheric greenhouse effect", and without it the Earth's surface would be much colder.
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fact
human
climate
Glaciers are in rapid retreat worldwide, despite 1 error in 1 paragraph in a 3000 page IPCC report.
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fact
human
climate
"In 1999 New Scientist reported a comment by the leading Indian glaciologist Syed Hasnain, who said in an email interview with this author that all the glaciers in the central and eastern Himalayas could disappear by 2035.
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fact
human
climate
Satellites and on-site measurements are observing that Himalayan glaciers are disappearing at an accelerating rate.
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fact
human
climate
The geologic record provides us with abundant evidence for such perpetual natural climate variability, from icecaps reaching almost to the equator to none at all, even at the poles.
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fact
human
climate
Different areas of science are understood with varying degrees of certainty.
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fact
human
climate
Poorly understood aspects of climate change do not change the fact that a great deal of climate science is well understood.
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fact
human
climate
Observed sea levels are actually tracking at the upper range of the IPCC projections.
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fact
human
climate
This small warming is likely a result of the natural alterations in global ocean currents which are driven by ocean salinity variations.
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fact
human
climate
"The IPCC also made false predictions on the Amazon rain forests, referenced to a non peer-reviewed paper produced by an advocacy group working with the WWF.
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fact
human
climate
The IPCC statement on Amazon rain forests is correct.
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fact
human
climate
On a world scale coral reefs are in decline.
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fact
human
climate
Over the last 30-40 years 80% of coral in the Caribbean have been destroyed and 50% in Indonesia and the Pacific.
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fact
human
climate
If the CO2 effect was saturated, adding more CO2 should add no additional greenhouse effect.
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fact
human
climate
However, satellite and surface measurements observe an enhanced greenhouse effect at the wavelengths that CO2 absorb energy.
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fact
human
climate
While methane is a more potent greenhouse gas than CO2, there is over 200 times more CO2 in the atmosphere.
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fact
human
climate
...Livestock are responsible for 18 per cent of the greenhouse gases that cause global warming, more than cars, planes and all other forms of transport put together.
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fact
human
climate
Burning fuel to produce fertiliser to grow feed, to produce meat and to transport it - and clearing vegetation for grazing - produces 9 per cent of all emissions of carbon dioxide, the most common greenhouse gas.
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fact
human
climate
The final amount of extra CO2 that remains in the atmosphere stays there on a time scale of centuries.
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fact
human
climate
[T]he overwhelming majority of peer-reviewed studies  [find] that CO2 in the atmosphere remained there a short time.
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fact
human
climate
CO2 levels are measured by hundreds of stations scattered across 66 countries which all report the same rising trend.
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fact
human
climate
"The Keeling curve, which is widely used to show the increase in CO2 emissions, is based on data from the top of Mount Mauna Loa in Hawaii.
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fact
human
climate
"...the largest of all the positive or temperature-amplifying feedbacks in the UN’s arsenal is the water-vapor feedback.
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fact
human
climate
Neptune's orbit is 164 years so observations (1950 to present day) span less than a third of a Neptunian year.
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fact
human
climate
"A new storm and a new red spot on Jupiter hints at climate change, USA TODAY and dozens of other sources explained yesterday.
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fact
human
climate
Jupiter's climate change is due to shifts in internal turbulence fueled from an internal heat source - the planet radiates twice as much energy as it receives from the sun.
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fact
human
climate
The "decline" refers to a decline in northern tree-rings, not global temperature, and is openly discussed in papers and the IPCC reports.
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fact
human
climate
"Mike's Nature trick" has nothing to do with "hide the decline", instead refering to a technique by Michael Mann to plot instrumental temperature along with past reconstructions.
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fact
human
climate
The decline in tree-ring growth is openly discussed in papers and IPCC reports.
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fact
human
climate
The divergence of tree-ring proxies from temperatures after 1960 is openly discussed in the peer-reviewed literature and the last two IPCC assessment reports.
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fact
human
climate
Currently, humans are emitting around 29 billion tonnes of carbon dioxide into the atmosphere per year.
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fact
human
climate
Warming causes more moisture in the air which leads to more extreme precipitation events.
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fact
human
climate
Far from contradicting global warming, record snowfall is predicted by climate models and consistent with our expectation of more extreme precipitation events.
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fact
human
climate
Measurements of carbon isotopes and falling oxygen in the atmosphere show that rising carbon dioxide is due to the burning of fossil fuels and cannot be coming from the ocean.
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fact
human
climate
Pluto's climate change over the last 14 years is likely a seasonal event.
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fact
human
climate
There are a myriad of other radiative forcings that affect the planet's energy imbalance.
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fact
human
climate
Volcanoes, solar variations, clouds, methane, aerosols - these all change the way energy enters and/or leaves our climate.
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fact
human
climate
While there are many drivers of climate, CO2 is the most dominant radiative forcing and is increasing faster than any other forcing.
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fact
human
climate
The Independent Climate Change Email Review investigated the CRU scientists' actions relating to peer review.
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fact
human
climate
The Review concluded that CRU's actions were normal and did not threaten the integrity of peer review.
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fact
human
climate
While it's true that any single country's CO2 emissions reductions will make little difference, only if every nation agrees to limit CO2 emissions can we achieve significant cuts on a global scale.
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fact
human
climate
The full data for latitudes 64-90°N reveal the Arctic is warmer today than in 1940.
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fact
human
climate
When you account for the effects which are not reflected in the market price of fossil fuels, like air pollution and health impacts, the true cost of coal and other fossil fuels is higher than the cost of most renewable energy technologies.
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fact
human
climate
The news of expanding Antarctic sea ice stole headlines from global warming alarmists who asserted Arctic sea ice had reached its lowest extent since 1979.'
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fact
human
climate
The result did suggest the sea level was increasing in the western Pacific, but this was offset by a drop in the level near the Alaskan coast.
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fact
human
climate
A number of independent studies using near-global satellite data find positive feedback and high climate sensitivity.
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fact
human
climate
It appears, for the entire tropics, the observed outgoing radiation fluxes increase with the increase in sea surface temperatures (SSTs).
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fact
human
climate
When you read Phil Jones' actual words, you see he's saying there is a warming trend
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fact
human
climate
Dropped stations show more warming than kept stations.
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fact
human
climate
Two American researchers allege that U.S. government scientists have skewed global temperature trends by ignoring readings from thousands of local weather stations around the world, particularly those in colder altitudes and more northerly latitudes, such as Canada.
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fact
human
climate
However, studies have determined that current technology is sufficient to reduce greenhouse gas emissions the necessary amount, and that we can do so without significant impact on the economy.
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fact
human
climate
Global warming is an increasingly urgent problem.
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fact
human
climate
The long term trend from albedo is of cooling.
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fact
human
climate
"Earth’s Albedo has risen in the past few years, and by doing reconstructions of the past albedo, it appears that there was a significant reduction in Earth’s albedo leading up to a lull in 1997.
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fact
human
climate
The most interesting thing here is that the albedo forcings, in watts/sq meter seem to be fairly large.
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fact
human
climate
The long term trend from albedo is that of cooling.
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fact
human
climate
Europe and Asia emit most of the soot from burning coal, wood, dung, and diesel in open fires or without particulate filters in stoves, chimneys, smokestacks, and exhaust pipes.
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fact
human
climate
'On June 23, 1988, NASA scientist James Hansen testified before the House of Representatives that there was a strong "cause and effect relationship" between observed temperatures and human emissions into the atmosphere.
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fact
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climate
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