With unconditional evidence of serious global warming, sites like this from San Francisco will become common place. Many people state this is not happening and any atmospheric changes are due to regular and natural phenomena. They are all fundamentally WRONG&. are we just going to wait and find out?.. say it is not a problem . .. That may be the biggest gamble in human history.. I would rather not take. The time for action is NOW for probably the greatest environmental challenge we've ever faced -- our governments has been alarmingly slow to act. . . . . .