Why is Mars going through a warming trend also, if global warming is completely a man-made phenomenon?
There is no evidence that this is so. “… to the extent it is sensible to speak of a mean temperature for Mars, the evidence is for significant cooling from the 1970’s, when Viking made measurements, compared to current temperatures. However, this is essentially due to large scale dust storms that were common back then, compared to a lower level of storminess now. The mean temperature on Mars, averaged over the Martian year can change by many degrees from year to year, depending on how active large scale dust storms are.
