Scientists are studying the issue, more data is accumulating, and evidence is mounting, yet a large portion of the population dismiss it and call it hog wash. At what point do those skeptics say hey, there might be something to this? It's like Galileo, ("the Father of Modern Science") talking to the Catholic Church about science; he just as well have talked to a brick wall.

I'm not a scientist, nor even remotely close to being one, but at some point must I have trust in what the experts are saying.

http://climate.nasa.gov/evidence