Sifting through theories of climate change

As world leaders discuss plans for a more eco-friendly global environment, there are still plenty of theories being challenged by political theoriests who consider a range of perspectives in addressing the problem of global climate change.

Some theories are undisputed while many others do not stand up to scrutiny.

Steff Gaulter, Al Jazeera's meteorologist, sifts through some of them in this report.