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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. | SUPPORTS | fact | human | climate |
Increased CO2 makes more water vapor, a greenhouse gas which amplifies warming | SUPPORTS | fact | human | climate |
Water vapour is the most dominant greenhouse gas. | SUPPORTS | 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 | SUPPORTS | fact | human | climate |
The costs of inaction far outweigh the costs of mitigation. | SUPPORTS | fact | human | climate |
Greenland on the whole is losing ice, as confirmed by multiple satellite and on the ground field measurements. | SUPPORTS | fact | human | climate |
While the Greenland interior is in mass balance, the coastlines are losing ice. | SUPPORTS | fact | human | climate |
Overall Greenland is losing ice mass at an accelerating rate. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
While the greenhouse effect is a natural occurence, too much warming has severe negative impacts on agriculture, health and environment. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
Satellite and surface measurements find less energy is escaping to space at CO2 absorption wavelengths. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
Even during a period of long term warming, there are short periods of cooling due to climate variability. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
The IPCC blames human emissions of carbon dioxide for the last warming. | SUPPORTS | fact | human | climate |
Greenhouse gases have been the main contributor of warming since 1970. | SUPPORTS | fact | human | climate |
Furthermore, it is physically incorrect to state that the planet is simply "recovering" from the Little Ice Age. | SUPPORTS | fact | human | climate |
There are a number of forcings which affect climate (eg - stratospheric aerosols, solar variations). | SUPPORTS | fact | human | climate |
The main reason behind this mid-century cooling was global dimming due to anthropogenic sulfate aerosol emissions. | SUPPORTS | fact | human | climate |
Early 20th century warming was in large part due to rising solar activity and relatively quiet volcanic activity. | SUPPORTS | fact | human | climate |
Volcanoes have been relatively frequent and if anything, have exerted a cooling effect. | SUPPORTS | fact | human | climate |
Warming trends agree well with surface temperatures and model predictions except near the Poles. | SUPPORTS | fact | human | climate |
The global dimming trend reversed around 1990 - 15 years after the global warming trend began in the mid 1970's. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
The El Nino Southern Oscillation shows close correlation to global temperatures over the short term. | SUPPORTS | fact | human | climate |
Mount Kilimanjaro's shrinking glacier is complicated and not due to just global warming. | SUPPORTS | fact | human | climate |
'Gore claims the snowcap atop Africa's Mt. Kilimanjaro is shrinking and that global warming is to blame. | SUPPORTS | 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.' | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
In 1946, PDO switched to a cool phase. | SUPPORTS | fact | human | climate |
In 1977, PDO switched to a warm phase. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
This is called the "atmospheric greenhouse effect", and without it the Earth's surface would be much colder. | SUPPORTS | fact | human | climate |
Glaciers are in rapid retreat worldwide, despite 1 error in 1 paragraph in a 3000 page IPCC report. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
Satellites and on-site measurements are observing that Himalayan glaciers are disappearing at an accelerating rate. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
Different areas of science are understood with varying degrees of certainty. | SUPPORTS | fact | human | climate |
Poorly understood aspects of climate change do not change the fact that a great deal of climate science is well understood. | SUPPORTS | fact | human | climate |
Observed sea levels are actually tracking at the upper range of the IPCC projections. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
The IPCC statement on Amazon rain forests is correct. | SUPPORTS | fact | human | climate |
On a world scale coral reefs are in decline. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
If the CO2 effect was saturated, adding more CO2 should add no additional greenhouse effect. | SUPPORTS | fact | human | climate |
However, satellite and surface measurements observe an enhanced greenhouse effect at the wavelengths that CO2 absorb energy. | SUPPORTS | fact | human | climate |
While methane is a more potent greenhouse gas than CO2, there is over 200 times more CO2 in the atmosphere. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
The final amount of extra CO2 that remains in the atmosphere stays there on a time scale of centuries. | SUPPORTS | fact | human | climate |
[T]he overwhelming majority of peer-reviewed studies [find] that CO2 in the atmosphere remained there a short time. | SUPPORTS | fact | human | climate |
CO2 levels are measured by hundreds of stations scattered across 66 countries which all report the same rising trend. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
"...the largest of all the positive or temperature-amplifying feedbacks in the UN’s arsenal is the water-vapor feedback. | SUPPORTS | fact | human | climate |
Neptune's orbit is 164 years so observations (1950 to present day) span less than a third of a Neptunian year. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
The decline in tree-ring growth is openly discussed in papers and IPCC reports. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
Currently, humans are emitting around 29 billion tonnes of carbon dioxide into the atmosphere per year. | SUPPORTS | fact | human | climate |
Warming causes more moisture in the air which leads to more extreme precipitation events. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
Pluto's climate change over the last 14 years is likely a seasonal event. | SUPPORTS | fact | human | climate |
There are a myriad of other radiative forcings that affect the planet's energy imbalance. | SUPPORTS | fact | human | climate |
Volcanoes, solar variations, clouds, methane, aerosols - these all change the way energy enters and/or leaves our climate. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
The Independent Climate Change Email Review investigated the CRU scientists' actions relating to peer review. | SUPPORTS | fact | human | climate |
The Review concluded that CRU's actions were normal and did not threaten the integrity of peer review. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
The full data for latitudes 64-90°N reveal the Arctic is warmer today than in 1940. | SUPPORTS | 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. | SUPPORTS | 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.' | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
A number of independent studies using near-global satellite data find positive feedback and high climate sensitivity. | SUPPORTS | fact | human | climate |
It appears, for the entire tropics, the observed outgoing radiation fluxes increase with the increase in sea surface temperatures (SSTs). | SUPPORTS | fact | human | climate |
When you read Phil Jones' actual words, you see he's saying there is a warming trend | SUPPORTS | fact | human | climate |
Dropped stations show more warming than kept stations. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
Global warming is an increasingly urgent problem. | SUPPORTS | fact | human | climate |
The long term trend from albedo is of cooling. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
The most interesting thing here is that the albedo forcings, in watts/sq meter seem to be fairly large. | SUPPORTS | fact | human | climate |
The long term trend from albedo is that of cooling. | SUPPORTS | 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. | SUPPORTS | 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. | SUPPORTS | fact | human | climate |
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