Essays / Thesis statements on global warming? [26]

Global warming negative effects research - my thesis statement

thesis statement: global warming is a serious matter in today's society. to prtect the health of the Earth, we must first acknowledge the negative effects of global warming.

i thought this was a good thesis statement, but to my surpris iw as wrong. my teacher wrote this about it; manmade effects of global warming? can it be reversed?

Essays / Thesis statements on global warming? [26]

ok and becasue my research paper is complete, would it be ok for me to just add an explanation at the end of each paragraph on why and how each cause is man made related?

i have 4 body paragraph topics.
I: effects on atmosphere
II: effects on agricultrue
III: effects on oceans
IV: effects on humans