Two Questions

I watched the debate that went on in committee about the Cap and Trade and climate change bill. I have two questions? what is the temperature you want the world to be set at and what will you do if the globe goes through a cooling cycle and we start to slide towards another ice age?
The cap portion of cap and trade is about carbon emmisions, well what happends if it works and the world starts to cool? or is this all about having more government control over the economy?