Greetings!
It can be great to research a topic on which much has been written, but the flip side, as you have discovered, is that there can be a lot to wade through! Here's an idea for a thesis: "For millenia, humans have treated the Earth as a never-ending resource, to be utilized and squandered at will. Recent years have shown that there is a price to be paid for this hubris, and the prospect of catastrophic results from global warming have the Earth's human inhabitants scrambling to make amends before it is too late. While the cure is neither quick nor certain, there are things which people can do to diminish their contribution to the problem of global warming, lighten the imprint of their footprint on the Earth, and perhaps even reverse the damage which has been done."
A start similar to this will introduce both the topic of global warming and lay the groundwork for the solutions you will discuss. You can start with what is known about the causes of global warming, its initial rejection and reluctant acceptance as a theory, and then get into the things we can do to ameliorate it.
I hope this helps get you started!
Thanks,
Sarah, EssayForum.com
Sarah, EssayForum.com