Originally Posted by broncosteven
The other factor is the wobble of the Earth on the axis. I live where a huge glacier once stood that carved the great lakes. I really think the roation of Earth's axis impacted the ice ages and the recent heat up. Does CO2 play a big part in the warm up? Yes! Is it all man made? Nope, can we control it? Nope.
I think reducing CO2 emmissions is just plain common sense. They have proof that the Earth has gone through cycles of heat and cold throughout the millienia(sp?)
As a NASA enthusiast, you of all people have greater access to the scientific data behind the theoretical evidence regarding global warming.
If climate changes naturally over time, why isn't the current warming just another natural cycle?
The industrial activities that our modern civilization depends upon have raised atmospheric concentrations of carbon dioxide and methane to higher levels than at any point during the last 650,000 years. Scientists agree it is very likely that most of the global average warming since the mid-20th century is due to the human-induced increases in greenhouse gases, rather than to natural causes.
While natural variations have altered the climate significantly in the past, it is very unlikely that the changes in climate observed since the mid-20th century can be explained by natural processes alone.