In MLA format, when citing a source with multiple authors, the general rule is to list the authors in the order they appear on the source. For a source with two authors, you should list them in the following format:
Last Name, First Name, and First Name Last Name. Title of the Book/Article. Publisher, Year of Publication.
For example, if you were citing a book by authors Jane Smith and John Doe, it would look like this:
Smith, Jane, and John Doe. The Impact of Climate Change. Climate Press, 2020.
If the work has three or more authors, you only list the first author's name followed by "et al." This would look like:
Last Name, First Name, et al. Title of the Book/Article. Publisher, Year of Publication.
For example:
Johnson, Emily, et al. Climate Change and Global Responses. Earth Publishers, 2021.
Make sure to adjust the specifics to fit the actual source you're referencing in your research paper on climate change.