Green House Gases
The concentration of Greenhouse gases has been increasing since about the mid 18 hundreds. This is primarily due to the invention of the steam engine which used the fossil fuel coal as its energy source.

Molecule Name Sources
CO2
 		    
CH4
 		    
N02
 		    
CF2Cl2    

> the accumulation of Greenhouse gases continue to drive up mean temperatures globally

> temperature rises tend to the most dramatic at the poles and least at the equator

> once the effect takes hold various other mechanism may set into place that cause the global climate to "flip"  into another state after a period of chaos