The wingnut climate denial trope that Smith was trying to propagate is the one soundly debunked by Peter Sinclair in this “Climate Denial Crock of the Week”.

Mars Attacks!!!

it was quite popular 2007-2009 and basically went “other planets are warming too & it’s solar causation” or the outright make shit up lie “Mars warmed at the same rate as planet Earth, proving solar forcing, not AGW”