Research Papers / Need help creating a Thesis for research essay regarding global warming. [2]

Hello!
I'm having a hard time creating a thesis for a topic. For my assignment, we are allowed to pick any topic to do our research essay on.

I was wondering if it is okay to make my topic "Is global warming a serious environmental issue that negatively affects life on Earth?" considering that in my essay, I wanted to talk about how global warming affects the environment, our health, and the economy. I would like to integrate the issue of greenhouse gases and how people emit them because it is a large factor that is responsible for Global Warming... however i'm not sure how to alter my topic in order to be able to discuss all of this. I also need help coming up with a thesis too.

or..
I was considering the topic "is global warming man-made" however I wasn't sure how to create at thesis for this. My idea for a thesis was to say that human activities such as burning of fossil fuels, agriculture, and industrial practices contribute to global warming

In short, I would like to talk about the negative effects of global warming, but also the causes of global warming as well, in my research paper... but I am having issues coming up with a topic & thesis statement that can help me cover all of this and get started.

Any help is greatly appreciated..

-Confused student. ):

Additionally, I have done most of my research for this essay.
Coming up with a thesis statement that can help me get started is proving to be difficult for me, as I have lots of info but don't know how to put it all down into a statement.. & THREE POINT thesis..

... :c