This science teacher presents good sounding logic of why we SHOULD take action against Global Warming, whether or not humans are causing it. Don't get put off by his experiments in between. Listen to his reasoning. Basically we can buy 2 lotery tickets: one where we are trying to fight global warming, and one where we're not (basically what we're doing now: wait, as we're not sure whether it will become an issue). This guy shows us what the consequences are of buying either ticket, and it seems a no brainer what we should do.
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