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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Ocean levels are rising twice as fast today as they were 150 years ago, and human-induced warming appears to be the culprit
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New observations show that man-made aerosols may be having a greater direct effect on our climate than previously thought
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global warming will reduce glaciers and storage packs of snow in regions around the world, causing water shortages and other problems that will impact millions of people
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direct heat of the sun on temperature probes of the weather balloon (radiosonde) probably explains the discrepancy between reports showing that atmospheric temperatures have been unchanged since the 1970’s, while temperatures at the Earth’s surface are rising ... Unfortunately, the warming is in an accelerating trend
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A warming signal has penetrated into the world's oceans over the past 40 years. The signal is complex, with a vertical structure that varies widely by ocean; it cannot be explained by natural internal climate variability or solar and volcanic forcing, but is well simulated by two anthropogenically forced climate models. We conclude that it is of human origin, a conclusion robust to observational sampling and model differences. Changes in advection combine with surface forcing to give the overall warming pattern. The implications of this study suggest that society needs to seriously consider model predictions of future climate change.
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no indication of a systematic trend in the level of solar activity that can explain the most recent global warming
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over the last 50 years 87% of 244 glaciers studied have retreated, and that average retreat rates have accelerated
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results clearly indicate that the warming is produced anthropogenically ... The statistical significance of these results is far too strong to be merely dismissed and should wipe out much of the uncertainty about the reality of global warming.
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