No one denies that climate changes -- no one. I can walk outside and show you the geologic evidence of our last ice age, and boy, has the climate sure changed since then. The climate has also been much hotter, much wetter, and with far higher levels of CO2 than today, and there is plenty of geologic evidence for that, too.
The question is whether people are causing warming, not whether the climate is changing.
Call me unconvinced. I have yet to hear any theory that adequately explains both the changes we see in the geologic record, and the changes reportedly caused by Man. It takes a huge amount of warming to move from an ice age to today. Where did that warming come from, if not from humans, and may it, not humans, be responsible for any warming we are seeing today?
These don't seem to be unreasonable questions to me, and telling me that 97% of climate scientists think the world is warming is irrelevant and doesn't answer the question.