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Here's an org that is communicating what many scientists believe through language that attempts to bring divided people together to fight a common enemy. They use WWII programs as a touchstone: http://www.theclimatemobilization.org

Their key documents address the issue of how best to tell people something they really don't want to hear, etc: http://www.theclimatemobilization.org/key_documents

Changing people's minds 'for their own good' is a really hairy problem.