Abstract
USING VERY STRONG language, a United Nations panel says global warming is unequivocal and human activities are the major factor responsible for the temperature rise. The report, released in Paris on Feb. 2, concludes that there is a greater than 90% certainty that Earth's temperature rise since 1950 has been caused by human greenhouse gas emissions and land-use changes. Using best estimates, it says, global average temperatures will rise 1.8 to 4.0 °C by 2100 relative to 2000. In contrast, the change from the 19th to the 20th century was 0.76 °C. Even if atmospheric levels of greenhouse gases are held constant at current levels, Earth will warm about 0.1 °C over each of the next few decades, the report says. The new and fourth assessment, by the UN Intergovernmental Panel on Climate Change (IPCC), relies on a larger number of climate models of increasing complexity and realism than the previous assessment. Consequently, its projections ...
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