[Sweetjustusnow]

Climate change happens. What happened to the previous ice age? What caused the warming then? There weren't combustible engines then. So what caused it?

http://www.junkscience.com/

[redboiling]

No one, but no one, claims that the only way warming can be caused is by human activities and waste and combustible engines. Everyone on all sides agrees there is long term climatic variation. The disagreement is whether recent human activities *add* onto that.