To believe that, you cannot be reading the global warming literature. It's part of the anthropogenic global warming argument to examine the past 10,000 years in order to provide perspective on the present.

Climatologists use millions of years of data. The point I am making is that the gradual destruction Mars' atmosphere doesn't matter if it's slow enough. All of recorded history is only about 5000 years.

Yes to the first, no to the second. The sun's temperature is gradually increasing on a large time scale.

The sun's temperature isn't going to significantly increase or decrease in the next 10,000 years, and temperature is not what I was talking about. The sun used to have more activity that stripped Mars of its atmosphere.

Earlier in its lifetime, the sun was more active than it is today, so sputtering was probably a more important process for removing the atmosphere, Curry said. Understanding that process will help scientists figure out what they see on other worlds.