"The presence of liquid water was not all that long in terms of the full geological history."-Shannon Curry 

This LPI is about atmospheric loss on Earth, Venus, and Mars. The methods for finding those rates are headache inducing, but if you have the skills then the details you need to recreate the research are in here. 

• Slide at 1:45 our speaker defines a few categories of how atoms escape their planet. She uses the term Jean’s Escape, which just means hotter, lighter molecules escape more regularly than heavy and cold molecules. 
• At 3:35 Venus’ ion escape is highlighted. The greater the solar wind, the more Venus builds an induced magnetic field, thus slowing the erosion rate. However the ionic pressure of solar-wind protons still picks up any negatively charged atoms they come into contact with, so the slowing is weak yet turbulent. 
• Slide at 7:00, photo-chemical escape is dominant on Mars, largely because the two oxygen's in carbon-dioxide are essentially exposed. When a heavy molecule tries to escape Mars, it usually does, and Mars cannot recollect it as easily as Earth and Venus can.
• At 10:10 the most important part in my opinion, the method they use to predict past atmospheres is tricky. One can’t just scale the current rate back in time to get the old atmosphere. Certain assumptions are taken on and the modelers know they won’t all work out. The bottom line is extrapolating old atmospheres is an active field that has a long way to go. 
• Slide at 11:25, Mars must have been losing the lions share of it’s peak atmosphere over only the Noachian. You can’t wind it back from anywhere near were it is at anything close to it’s current rate of loss. The climate of Mars would have been cooling noticeably year to year as soon as Mars was solid. 

This lecture is just a bit older than the Phosphine announcement, so she doesn’t yet know of the upcoming probes heading to Venus. I was really happy to find this lecture again, I saw it when it was recent and often would refer to it, but couldn't recall detail enough to find it in LPI’s archive. When MAVEN concluded it’s primary goals they did a team press conference where all the investigators had a bit, and I think Curry was one of them. Our speaker Curry by the way is the current PI of MAVEN while Jakowsky was the original one. That talk (which I swear was a Von Karmen lecture) seems to not exist anymore but it was the best MAVEN report I saw. Much of the content in there recurs about three years later in this lecture.