Let's now get specific on the causes of Climate Change (the more neutral, broader phrase for global warming).
1) What are some of the specific gases that are classified as "greenhouse gases?" In what amounts do they exist in the atmosphere, and which are the most potent gases?
2) Where do they come from, how are they produced?
3) If at least part of the warming can be attributed to natural causes, what separates our current climate change from previous historic warmings?