I know, still I an not sure what is better, asking an LLM or googling? (google search has been quietly deteriorating)

As time progresses "better" becomes "going to the public library and working with a research librarian to figure it out."

LLM then Google? "The greening of Mars" is not by Stanley Robinson, but by James Lovelock and Michael Allaby. It doesn't appear to feature moving Mars, but terraforming it using 80's technology. I don't think "Green Mars" by Robinson has Mars being moved either.

There's nothing on Google for Benford and "Martian Transfer", though it's possible he wrote such a story with a different title.

LLM approximates throwing the google snippets into a blender so that you can't evaluate anything and the nouns are very likely to get swapped.

Googling is much better.