The warming around Earth's tropical belt is a signal suggesting that the "climate system has exceeded a critical threshold," which has sent tropical-zone glaciers in full retreat and will melt them completely "in the near future"
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Global warming provided much of the ocean heat that fueled last year's record-setting hurricane season ... global warming accounted for nearly half of the above-normal ocean heating that fed 15 Atlantic hurricanes ... Natural climate cycles were only a minor factor in the excess warming
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sufficient evidence from tree rings, boreholes, retreating glaciers, and other "proxies" of past surface temperatures to say with a high level of confidence that the last few decades of the 20th century were warmer than any comparable period in the last 400 years ... scientists' reconstructions of Northern Hemisphere surface temperatures for the past thousand years are generally consistent ... multiple lines of evidence supporting the conclusion that current warming is occurring in response to human activities
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Thawing permafrost in the Arctic could play a role in fueling global warming ... The reservoir is very large and dangerous ... frozen soils across a large swath of Siberia and Alaska hold nearly 500 billion tons (454 billion metric tons) of carbon—or two-thirds current atmospheric levels.
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Human-induced climate change, rather than naturally occurring ocean cycles, may be responsible for the recent increases in the frequency and strength of North Atlantic hurricanes ... North Atlantic sea surface temperature appears to be controlled largely by radiative forcing, which has changed over the past century mainly owing to sulfate aerosol pollution and greenhouse gas increases
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climate change estimates for the next century may have substantially underestimated the potential magnitude of global warming. They say that actual warming due to human fossil fuel emissions may be 15-to-78 percent higher than warming estimates that do not take into account the feedback mechanism involving carbon dioxide and Earth's temperature.
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global climate change can set-off positive feedback loops in nature which amplify warming and cooling trends ... able to quantify the feedback implied by past increases in natural carbon dioxide and methane gas levels. Their results point to global temperatures at the end of this century that may be significantly higher than current climate models are predicting.
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Glaciers on China's Qinghai-Tibet plateau are shrinking by seven per cent a year because of global warming ... four decades of data from 681 Chinese weather stations, concludes that global warming is to blame.
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Global warming caused by human activity has begun to dampen an important wind circulation pattern over the Pacific Ocean, and that could alter climate and the marine food chain ... simulations that consider only natural influences fail to produce the observed slowdown
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there is no longer a discrepancy in the rate of global average temperature increase for the surface compared with higher levels in the atmosphere. This discrepancy had previously been used to challenge the validity of climate models used to detect and attribute the causes of observed climate change ... The evidence continues to support a substantial human impact on global temperature increases.
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A new analysis of the past 30 years of records from nine research stations, including Amundsen-Scott at the South Pole, reveals that the air above the entirety of Antarctica has warmed by as much as 0.70 degree Celsius per decade during the winter months ... warming trend is consistent across data from multiple stations run by multiple countries using multiple types of instruments.
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Water from melting ice sheets and glaciers is gushing into the world's oceans much faster than previously thought possible ... The unexpected deluge is raising global sea levels, which scientists say could eventually submerge island nations, flood cities, and expose millions of coastal residents to destructive storm surges.
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NASA scientists have found that a major form of global air pollution involved in summertime "smog" has also played a significant role in warming the Arctic.
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According to this new research, ozone was responsible for one-third to half of the observed warming trend in the Arctic during winter and spring. Ozone is transported from the industrialized countries in the Northern Hemisphere to the Arctic quite efficiently during these seasons.
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This comprehensive study found the ice sheet's mass has decreased significantly from 2002 to 2005.
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The estimated mass loss was enough to raise global sea level about 1.2 millimeters
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Human activities are releasing greenhouse gases more than 30 times faster than the rate of emissions that triggered a period of extreme global warming in the Earth's past.
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Compounding this concern is the possibility that higher temperatures could retard ocean mixing, further reducing the ocean's capacity to absorb carbon dioxide. This could have the kind of "positive feedback" effect that climate researchers worry about: reduced absorption, leaving more carbon dioxide in the air, causing more warming.
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Scientists have found evidence that tropical Atlantic Ocean temperatures may have once reached 107°F (42°C)—about 25°F (14°C) higher than ocean temperatures today and warmer than a hot tub. The surprisingly high ocean temperatures, the warmest estimates to date for any place on Earth, occurred millions of year ago when carbon dioxide levels in Earth’s atmosphere were also high, but researchers say they may be an indication that greenhouse gases could heat the oceans in the future much more than currently anticipated. The study suggests that climate models underestimate future warming.
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The most significant and longest duration feature during the last 1200 years is the geographical extent of warmth in the middle to late 20th century. Positive anomalies during 890 to 1170 and negative anomalies during 1580 to 1850 are consistent with the concepts of a Medieval Warm Period and a Little Ice Age, but comparison with instrumental temperatures shows the spatial extent of recent warmth to be of greater significance than that during the medieval period.
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Enhanced aerosol concentrations increase the amount of thermal energy emitted by many Arctic clouds... The Arctic is showing the first unmistakable signs of climate warming caused by human activities, in the form of rapidly retreating and thinning sea ice
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Current levels of the greenhouse gases, carbon dioxide and methane, are higher now than they have ever been in 650,000 years
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Planting trees across the United States and Europe to absorb some of the carbon dioxide emitted by the burning of fossil fuels may just outweigh the positive effects of sequestering that CO².
In theory, growing a forest may sound like a good idea to fight global warming, but in temperate regions, such as the United States, those trees also would soak up sunlight, causing the earth’s surface to warm regionally by up to 8 degrees Fahrenheit.
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