Quote:
Originally Posted by biskoppen
What caused all the previous global warming periodes the earth had thousands of years ago?
What causes the same global warming going on on Mars right now?
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1. All periods were not human made, but that do not change the fact that the earth is warmer than it is supposed to be today.
2. There is no evidence of global warming on Mars. It is only 1 icy spot melting, and this has been observed for only few years. On Earth we have tons of evidence and observed for many years. Even if that is the case, does not change the fact as I said above.