And how much of that increase has come because of better measurement of the earths temperature? There were no weather satellites in 1880. There were no digital, automatic buoys located all over the ocean to keep track of the water temp. The ability to keep track of global temperature is something that really didn't exist just 20 years ago. Even if the ice cores are right, and there is dispute about that, we can really only go back a couple of thousand years, at best. That is a nano second in the 5 billion year old climate of this planet. Climate change is absolutely real. It is the reason there is life on this planet. But the scientific concept of climate change has been prostituted into a concept of man made climate change in order to manipulate group think and to expand wealth in a certain segment. Propaganda starts with a kernel of truth. The truth, in this case, is that people look out the window and see weather patterns that have changed in their memory. They take this "truth" and bend it to advance an agenda, that this weather is somehow caused by your pick up truck or gas fired hot tub. They then come up with solutions that are more aimed at creating an industry than fixing anything. Of course, part of the propaganda is that anyone who questions the dogma is labeled as a Luddite or somehow not smart enough to grasp their concepts. Now they're cutting down forests to build solar farms, putting wind mills on mountain tops and in pristine coastal areas. And people get rich. Believe what you want but don't pea on my head and tell me its rain.