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Global warming refers to the increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation.
Global warming average air temperature near the Earth's surface rose 0.74 ± 0.18 °CF) during the last 100 years. The Intergovernmental Panel on Climate Change (IPCC) concludes, "most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations" via the greenhouse effect. Natural phenomena such as solar variation combined with volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward. These basic conclusions have been endorsed by at least 30 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries. A few individual scientists disagree with some of the main conclusions of the IPCC. (1.33 ± 0.32 °
Climate models referenced by the IPCC project that Global warming surface temperatures are likely to increase by 1.1 to 6.4 °C (2.0 to 11.5 °F) between 1990 and 2100.scenarios of future greenhouse gas emissions as well as models with differing climate sensitivity. Although most studies focus on the period up to 2100, warming and sea level rise are expected to continue for more than a millennium even if greenhouse gas levels are stabilized. This reflects the large heat capacity of the oceans. The range of values results from the use of differing
An increase in Global warming temperatures is expected to cause other changes, including sea level rise, increased intensity of extreme weather events, and changes in the amount and pattern of precipitation. Other effects include changes in agricultural yields, glacier retreat, species extinctions and increases in the ranges of disease vectors.
Remaining scientific uncertainties include the amount of Global warming expected in the future, and how warming and related changes will vary from region to region around the globe. There is ongoing political and public debate worldwide regarding what, if any, action should be taken to reduce or reverse future warming or to adapt to its expected consequences. Most national governments Kyoto Protocol, aimed at reducing greenhouse gas emissions.
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WASHINGTON: Two-thirds of the world's polar bears will disappear by 2050, even under moderate projections for shrinkage of summer sea ice caused by greenhouse gases in the atmosphere, according to government scientists.
The finding is part of a year-long review of the effects of climate and ice changes on polar bears to help determine whether they should be protected under the Endangered Species Act. Scientists estimate the current polar bear population at 22,000.
The report, which the U.S. Geological Survey released here Friday, offers stark prospects for polar bears as the world grows warmer.
Biologists and climate scientists conclude in the report that under middle-of-the-road projections for warming the bears will by midcentury be largely relegated to the Arctic archipelago of Canada and spots off the northern Greenland coast, where summer sea ice tends to persist even in warm summers like this one, a shrinking that could be enough to reduce the bears by two-thirds. Global warming
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