Re: Subtitle error
"This is erroneous, since the background loss rate (100 g/s) divided into the mass of the atmosphere gives a 7 billion year life"
That 100 g/s rate is the _current_ rate i.e. from a body that has already lost >99% of its atmosphere - it simply doesn't have enough atmosphere left to lose it at a higher rate. Furthermore, what atmosphere Mars does have left is 95% CO2, which is relatively heavy; if you were to start adding relatively light Oxygen to the atmosphere of Mars not only would the loss rate increase but it would be the lighter gases, such as the Oxygen, that that made up most of that increase.