... if one group says "We're making the planet warmer!" and the other group says "No we're not!" and it's the latter group (ostensibly) in power, then why couldn't the second group then say "Here: we'll show you. We'll scotch as much CO2 et al as we can and see if it makes a difference. If you're right, then the planet will stop getting warmer. If we're right, the planet will either keep getting hotter or will get a lot colder."

Wade.