I heard one of the most demented things of all times on NPR today. Some group of scientists (i guess they were scientists, maybe they were businessmen? and I only heard about a fraction of the clip) suggested something like this.  Put a big reflector in orbit around Mars and melt the ice caps.  What…  !!  we destroy earth, and now we set out to destroy Mars.  Is humanity so egocentric that it thinks that any hairbrained idea it gets should be brought to bear, even though it sounds like the plan of a toddler who tears apart things but can’t put them back together.

There are many posts on melting ice on Mars…

This was understood way back in “star trek” time… ha ha…. it was the PRIME DIRECTIVE