He's right, NASA has seen the same amount of warming on Mars over the last 50 years as we have experienced here. It doesn't mean that Global Warming isn't really a problem but there might not be anything we can do about it except plan for life afterward. Even if it is man made do you really think a few light bulbs and hybrids are going to make any difference? You can't stop Global Warming at this point, no matter what the cause is.