Recent studies show that both Mars and Earth are warming. This article suggests that the same thing may be causing both: increased solar radiation. As noted earlier, warming on a global scale has happened before. There are petrified trees in Antarctica where no trees grow today.
When warming happened before, man-made pollution was not the cause. For sure man-made pollution is not yet the cause on Mars. Are we having some effect on the warming of Earth? Probably. How much impact are we having relative to solar heating? Who knows? Is there any way to determine our impact? Doubtful, since we inhabit the petri dish we need to study.
