You can guess how I feel about it. But to be clear: it’s more denialist spin, nonsense, and noise. You can read the original leter here, and then I strongly suggest reading Shawn Otto’s devastating deconstruction of it. You can also read the response to this letter by NASA’s Chief Scientist Waleed Abdalatim if you’d like.
I’ll note that it doesn’t matter that former astronauts signed this propaganda letter — I’ve written about Apollo 17′s Harrison Schmitt and his climate change denialism before — but I note it does matter that of the 49 signatories on that letter, not one is an actual working climate scientist. That should give you pause. I’ll also note that 49 former NASA employees is a tiny, tiny fraction of the total. It’s not hard to find statistical outliers in a group that big. I knew a creationist who worked for NASA!
But really, my very favorite thing about this is the group behind the letter: a non-profit called Plants Need CO2, which, if you can believe it, actively advocates that more carbon dioxide is good for us.