Another report of global warming . . . from Mars:
Scientists from Nasa say that Mars has warmed by about 0.5C since the 1970s. This is similar to the warming experienced on Earth over approximately the same period.
Since there is no known life on Mars it suggests rapid changes in planetary climates could be natural phenomena.
The mechanism at work on Mars appears, however, to be different from that on Earth.
I would suggest a review of Occam’s Razor as a starting point before postulating how two adjacent planets in the same solar system might be warming concurrently. One commonality between the red planet and Earth is the increase in the number of SUVs on both planets. I can’t think of anything else similar between the planets, can you?