Get a social psych textbook, used. Same psych that got people to recycle. Actually should be online. search for social psychology and recycling. Also hitler and coercion.
My thought was a little simpler; tell the truth instead of lying. They freak out the leftists with pictures of the Statue of Liberty floating away. If they emphasized the likelihood of marginally arable land becoming productive, they might catch conservatives’ interest. Then they’d only have to show how bad that would be!