Denver Channel: Climate change and rising global temperatures are just a natural process that the earth has experienced many times over its long history. Whats not normal right now is the speed at which those temperatures are rising. Professing Scott Denning from Colorado State University joined us on the First Alert Spring Forecast to talk about climate change. He says the greenhouse effect is what keeps the earth inhabitable and that without CO2 in the atmosphere, the earth would be cod enough to freeze the...