But that's really what it is. In other words, in science, truth shifts as scientists change their minds. The global warming debate is no different from other scientific ideas.
Carbon dioxide allows sunlight to strike the earth, but traps some of the resulting heat.
This is not disputed. Sooner or later, this additional heat will warm the planet, just the way a glass roof warms a greenhouse. Very few scientists dispute this prediction. The increase has been carefully measured, and is not in dispute. Many of his colleagues scoffed and said no one could yet see the signal.