The U.N.-sponsored Intergovernmental Panel on Climate Change (IPCC) blames human activity for warming during the past 50 years. At least that's what it says in the report's summary for policy-makers; a Reader's Digest version of the full document is due out in May. It says the earth's temperature will increase between 3.2 degrees and 7.8 degrees in the next 100 years, and that sea levels will rise between 7 and 23 inches.
Cooler heads note the summary is more political than scientific, and that what counts is factual basis for the IPCC's conclusions that will be revealed in a few months.
Even so, global warming has people talking. President Bush mentioned it in his State of the Union speech. There's speculation former Vice President Al Gore will win an Oscar for his role in the global warming documentary "An Inconvenient Truth.” Democrats leading Congress say they plan to act on greenhouse gas emissions.