Global Warming

I read an interesting article on the web. The article talked about NASA stating that MARS is also warming. The article went on to say that if Mars is warming and the Earth is warming must be something beside greenhouse gas effect that is causing the warming. There is reported information of Sun Spot activity. Might be people are jumping the gun like they did in the 70 's with the new Ice Age scares that the earth was cooling and half of North America would be covered with a giant glacier.