Some Liberals have figured out how to solve the global warming issue; just stop having babies. Al Gore has talked about the need to reduce population as a solution. I am a skeptic so I have a couple of questions about this. In the past the Earth has been 9 F hotter than it is now, and carbon dioxide concentration in the atmosphere has been over 10 times greater. That happened before man was a factor. So, how do we know it wouldn't happen again even if there were few or even no humans around?