A question for climate change deniers

Just a question for deniers, since the science is already out there - What empirical "proof" would you need to convince you that global warming is getting worse, and is anthropogenic? Would the sky have to burst into flames? Perhaps we find a gigantic cauldron in middle of the US? Or, okay, how about this:

• Severe drought in Africa and Australia?


• Acidification of the oceans due to absorption of CO2?


• Hundreds of millions of climate refugees?


• Extinctions of species due to severe climate variation?


• Increased spread of tropical diseases and insects?

I know, I know, you can counter my evidence with the fact that "Wisconsin is really friggin' cold right now." I suggest that all those of you who actually think that is an argument against antrhopogenic climate change leave RIGHT NOW, so that people who actually understand science (at least from a primary-school level) can continue this conversation.