These questions usually arise due to observations of regional change around the south polar cap on Mars or brightening of Neptune. We have very little data to draw conclusions on based on only a few years observations. But drawing conclusions of global warming on earth from these observations is scientifically incorrect. The science involves an understanding of the length of the year of different planets (Mars is twice Earth’s), the nature of the planet’s orbit around the sun (Mars’ leads to 5 times the variation of incoming solar radiation experienced on Earth) and the angle of a planet’s spinning axis. All of this leads to Mars having very different summers and winters over tens of thousands of years. The shrinkage of the Martian South Polar Cap is almost certainly a regional climate change (ie. the end of winter), and is not any indication of global warming trends in the Martian atmosphere. With other planets either too little is known to draw conclusions or the conclusions being drawn are scientifically questionable. In any case, if it were true it only increases the imperative to do what we can.
One degree
