No one denies climate change because it's been a reality on Earth for 4.5 billion years. That's the beauty of the concept. Well, creationists and Static Earth Theory proponents ("the Earth has been the same always as it has been as things have been measured in the last century!") might deny it, but we'll let Santa and the Easter Bunny break the news to them.
Limiting fossil fuel use will keep our cheap priced society going, because if you don't conserve it there won't be any in a few decades to fuel said cheap society. It takes more energy to produce ethanol then it produces, hey there ain't going to be any 747 flights to Japan powered by solar. You can say goodbye to plastic too. Yeah, let's see how far your dollar goes when you got to pay for hand carved furniture again.