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In 4 minutes, atmospheric chemist Rachel Pike provides a glimpse of the massive scientific effort behind the bold headlines on climate change, with her team -- one of thousands who contributed -- taking a risky flight over the rainforest in pursuit of data on a key molecule.

At TEDxSydney, Rachel Botsman says we're "wired to share" -- and shows how websites like Zipcar and Swaptree are changing the rules of human behavior.

Will future megacities grow themselves, heal themselves and be at peace with their surrounding environment instead of in conflict with it? Yes. But only if only we decide to do it.