Earth becoming to hot to live on was going to happen eventually, us humans are just simply speeding up the process, not much else to it.
When the earth gets hot enough, it closes the NAC and the earth reverts into an ice age. But you're right about us just speeding things up. You must login or register to view this content.
What about increased Solar Activity? There's just as much proof for that as there is global warming. Imo Global Warming has been thrown way out of proportion by the media, just like everything else. E.g. Swine flu.
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