In this conversation roleplay, each student is given a card with a role to play. There are six roles--two climate change skeptics, one factory owner, one island fisherman, one farmer, and one climate scientist. The goal is for students to make an argument from the perspective of their role.
This activity forces the students to think from a perspective that may differ from their own, and to examine the issue from various viewpoints. It also helps students to speak up more in class, as having a basis for their discussion seems to make them more confident.
This could also be a great writing prompt or research assignment.