Essays / Thesis statements on global warming? [26]

How to create a thesis for a global warming essay?

Hello,

I have an essay which I must write on global warming. I have decided to base it around a quote by Tim Flannery. The quote is "... we are the generation fated to live in the most interesting of times, for we are now the weather makers, and the future of biodiversity and civilization hangs on our actions." After researching and reading Tim Flannery's book, I'm not exactly sure what my thesis will be. I want to focus mainly on humans making changes in weather due to global warming, I'm just not sure how to word it. The essay must be at least 2000 words and argumentative. I have to show both sides to global warming, but ultimately decide on one.

Thank you,

Maddi.