1. The earth does go through natural cooling and heating periods. 2. Dinosaurs already lived on a warmer earth than now. 3. Methane has nothing to do with the ozone layer. 4. Humans have both created holes in the ozone layer and released substantial amounts of greenhouse gases into the atmosphere. To say that we haven't done anything is ridiculous. 5. Most people nowadays don't believe in antropogenic global warming, but instead human accelerated global warming.