As does “Larry” above, I call “HOGWASH” on most of this Climate Change “stuff”.
Yes, things are getting warmer, it is “time” in the cyclical earth events.
Yes, humans do put out a lot of CO2 and other pollution that might add to the problem.
Yes, humans have the smarts and the ability to use technology to work towards easing the CO2 issues. We can possibly, with sci-fi level advances (certainly possible) even reverse that issue.
No, contrails are not the big issue and flying 2000 feet off altitude won’t change things a bit.
I’ve got a ton of time in 4 motor machines droning around the planet. There is not enough moisture change in a simple 2K ft altitude change to prevent contrails because the moisture band thickness strictly depends upon the weather systems driving the moisture layer.
I repat: HOGWASH