Check out this abstract: https://iopscience.iop.org/article/10.1088/0034-4885/68/6/R02/meta
Use scholarly/peer reviewed journal articles only for information, especially if you are going to paraphrase or quote your source. Your teacher will not want you to plagiarize.
It does not ask you to take a stance, so make sure you do not make it personal. First, read the article (or any other you find to educate yourself). Then, in the first few lines, state what global warming is (definition, in your words), the types of global warming, and when, where, and how global warming became a concern. It's an easy strategy for writing on any topic. Using the "Who/What, When, Where, How" strategy should be a cinch. Connect your ideas with transition words like: therefore, consequently, secondly, additionally, for example, etc.
Here is a link for more if you need: https://www.smart-words.org/linking-words/transition-words.html