By Dan Shapley
Republican presidential candidate John McCain will propose strict caps on carbon emissions to avert the "serious and urgent" security threat he says it poses. McCain, long a supporter of a cap-and-trade system to reduce carbon emissions, will lay out his position in a major policy speech today in Washington, D.C. Retired generals recently issued a report, calling global warming a serious threat to national security. The fear is that flooding, desertification and the like could destabilize parts of the developing world. The U.N. Security Council also recently considered the issue.