Find articles from a variety of sources. Tips: Limit to "Peer-Reviewed Journals" if you need scholarly articles only. Limit to "Available online" if you want articles that are immediately available.
Search using keywords such as:
Mars settlement
Mars colonization
Mars exploration policy
space settlement
You may want to add keywords such as "ethics," "morality," and so on. Example:
Contains papers both for and against human colonization of other worlds, including Mars. You can find in these papers issues your team should consider addressing.