Secondly, the Earth is over 4.5 billion years old. Changes that occur in our lifetimes, and during the existence of humans as we know them, are utterly insignificant. Things wax and wane. The planet has gone through five major ice ages and five mass extinctions, and out of those 10 events, humans were only around for the last one, an ice age ending 12,000 years ago. The worry is that compared to all the trends before, the amount of carbon dioxide in the atmosphere and the rate at which the globe is warming is unprecedented. Short time spans are not an example of what the planet is doing. That would be like me saying I don't have any more loan debt because I got paid last Friday. I can assure you, I am still in the red.