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> it doesn't prove one way or another whether the cause of the rise in greenhouse gasses is manmade.

Does anyone seriously doubt that rises in CO2 are not principally driven by human activity? I have never even seen that as a talking point.



Does the popularity of a doubt or idea even matter here when we're supposed to be discussing science?


Brakenshire didn't question the popularity of the topic, rather whether it had been convincingly postulated by anyone worth mentioning.


Sure. Michelle Bachmann believes lots of crazy things:

https://www.youtube.com/watch?v=IAaDVOd2sRQ

> And yet were being told that we have to reduce this natural substance and reduce the American standard of living to create an arbitrary reduction in something that is naturally occurring in the earth. Well were told the crux of this problem is human activity. Its humans that are creating more carbon dioxide!

> What part of human activity creates carbon dioxide? If carbon dioxide is a negligible gas and its only three percent of Earths atmosphere, what part is human activity?




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