Scientists long have issued the warnings: The modern world's appetite for cars, air conditioning and cheap, fossil-fuel energy spews billions of tons of carbon dioxide into the atmosphere, unnaturally warming the world.
Yet, it took the dramatic images of a hurricane overtaking New Orleans and searing heat last summer to finally trigger widespread public concern on the issue of global warming.
Problem is, global warming may not have caused Hurricane Katrina, and last summer's heat waves were equaled and, in many cases, surpassed by heat in the 1930s.
In their efforts to capture the public's attention, then, have climate scientists oversold global warming? It's probably not a majority view, but a few climate scientists are beginning to question whether some dire predictions push the science too far.