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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Five years after warning that the famed ice fields on Tanzania 's Mount Kilimanjaro may melt, Ohio State University researchers have sadly found that their prediction is coming true.
“The change there is so dramatic,” he [Lonnie Thompson] said. “We can see it both in the field and from aerial photographs of the mountaintop. I would say it is on track to disappear, and the rate of ice loss may even be accelerating.
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large-scale global warming is not a result of urban development... Measurements of night-time air temperature, averaged across a number of weather stations worldwide, show a rate of warming of around 0.19 °C per decade during the period 1950-2000. This rate is the same for calm conditions as it is for windy.
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Ice cores and other evidence of climate conditions in the distant past provide evidence that rising atmospheric carbon dioxide levels are associated with rising global temperatures. Human activities, primarily the burning of fossil fuels, and secondarily clearing of land, have increased the concentration of carbon dioxide, methane, and other heat-trapping ("greenhouse") gases in the atmosphere.
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Solar variability is unlikely to have been the dominant cause of the strong warming during the past three decades
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results confirm previous analyses showing that greenhouse gas increases explain most of the global warming observed in the second half of the twentieth century
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twenty-year record of space based measurements has been analyzed by researchers at NASA's Goddard Space Flight Center. Based on their findings, evidence of a warming planet continues to grow
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Emmissions of greenhouse gases and aerosols due to human activities continue to alter the atmosphere in ways that are expected to alter the climate
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The ocean has become warmer in the last 50 years and that warming is likely due to human-induced causes such as increases in atmospheric greenhouse gases
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identified the anthropogenic "fingerprint" of climate change that took into account the confounding effects of natural variations
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hard evidence that human activities have global-scale consequences
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