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Which TED talk was this?

I watched a TED talk in which a guy said that in terms of environmentalism, our picture of the future is always destruction and the end-of-the-world scenarios, but instead we should be painting a positive picture of the future, in which we overcome our environmental problems.
I don't remember which one it is, and I can't seem to find it. Can anyone help?

I know this is more of a straightforward question rather than a conversation, so please let me know what you think the proper ettiquette is for keeping the question up, removing it, or asking it somewhere else, etc.

Thank you in advance for your help. :-)