Reply 514 link was excellent thanks Horton!!<br...

Reply 514 link was excellent thanks Horton!!
Different temperatures over geologic time will help people to hopefully deal with global warming. One study theorized that it may take the Earth 40,000 years to recover from the atmospheric changes that we have caused so far. Over geologic time, the earth has gone through many climate imbalances and has managed to eventually stabilize it's biosphere.
Mars was not able to recover as well but it has certainly gone through many atmospheric and temerature changes.

I'll bet that there lots of magnetite crystals/grains on Mars and some of them likely (in my mind) were created in conjunction with life like bacteria or bacteria-like organisms. Of course we have yet to prove this.