Justin Hall-Tipping: Freeing energy from the grid
Justin Hall-Tipping demonstrates some amazing inventions at TEDGlobal 2011.
Justin Hall-Tipping demonstrates some amazing inventions at TEDGlobal 2011.
Climate activist Danny Bloom gives a virtual graduation speech to the class of 2099.
Partha Dasgupta and Amory Lovins answer the question whether it is costly to stop climate change.
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