Greenhouse gases play an important role in North American climate ... More than half of this warming is likely the result of human-caused greenhouse gas forcing of climate change
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The rate of warming we are seeing is unprecedented in human history.
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None of the natural processes can account for the overall warming trend in global surface temperatures ... solar forcing contributed negligible long-term warming in the past 25 years and 10% of the warming in the past 100 years
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Avoiding environmental damage from ocean acidification requires reductions in
carbon dioxide emissions regardless of climate change.
Study
atmospheric carbon dioxide is strongly correlated with Antarctic temperature throughout eight glacial cycles
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formally links observed global changes in physical and biological systems to human-induced climate change, predominantly from increasing greenhouse gases
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The groups went on to hypothesize that the decrease in ionization due to cosmic rays causes the decrease in cloud cover, thereby explaining a large part of the currently observed global warming. We have examined this hypothesis to look for evidence to corroborate it. None has been found and so our conclusions are to doubt it. From the absence of corroborative evidence, we estimate that less than 23%, at the 95% confidence level, of the 11 year cycle change in the globally averaged cloud cover observed in solar cycle 22 is due to the change in the rate of ionization from the solar modulation of cosmic rays.
abstract
More than three-quarters of the particulate pollution known as black carbon and transported at high altitudes over the West Coast during spring comes from Asia. The material not only affects climate in Asia, it also carries consequences for the Pacific Ocean region that drives much of the climate around the world.
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The least biologically productive areas of the oceans are expanding much faster than predicted ... This change in ocean biology, linked to the warming of sea surface waters, may negatively affect the populations of many fish species trying to survive in these desert-like environments ... Between 1998 and 2007, these expanses of saltwater with low surface plant life in the Pacific and Atlantic Oceans grew by 15 percent or 6.6 million square kilometers
According to a new study by scientists at the Carnegie Institution, halfway measures won’t do the job. To stabilize our planet’s climate, we need to find ways to kick the carbon habit altogether.
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If modern temperatures continue to rise as anticipated in the coming years the planet could see a similar increase in insect damage to crops and other plants ... We see a huge increase in the percent of plants that are being attacked
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If current climate models from the IPCC included data from ice dynamics in Greenland, the sea level rise estimated during this century could be twice as high as what they are currently projecting ... the changes we are seeing now are bigger than can be accounted for by normal, annual perturbations in climate
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Our findings suggest that a variety of tipping elements could reach their critical point within this century under human-induced climate change ... The greatest threats are tipping of the Arctic sea-ice and the Greenland ice sheet, and at least five other elements could surprise us by exhibiting a nearby tipping point.
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Ice loss in Antarctica increased by 75 percent in the last 10 years due to a speed-up in the flow of its glaciers and is now nearly as great as that observed in Greenland, according to a new, comprehensive study
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The concentration of carbon dioxide in the atmosphere in the 20th century increased ten times faster than at any other period in the preceding 22,000 years.
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The U.S. West will see devastating droughts as global warming reduces the amount of mountain snow and causes the snow that does fall to melt earlier in the year ... results are not good news for those living in the western United States
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Here we show that significant warming extends well beyond the Antarctic Peninsula to cover most of West Antarctica, an area of warming much larger than previously reported.
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recent warm summers have caused the most extreme Greenland ice melting in 50 years... summer 2003 was exceptionally warm around the margins of the Greenland Ice Sheet, which resulted in the second-highest meltwater running off from the Ice Sheet of the last 50 years. Summer 2005 experienced a record-high melt, which was very recently superseded in summer 2007
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