Speaking alongside former Vice President Al Gore at the World Economic Forum in Switzerland, Williams made the rather large promise that he was "literally going to have humanity harmonise all at once".
The Happy singer said of his new Live Earth tour: "Instead of just having people perform we literally - and I can’t go into it because there are some interesting surprises coming up soon - but we are literally going to have humanity harmonise all at once."
He added: "And I am very very happy and proud to be a part of this [pause] moment for our species, we’re a very precious species and if we’re learned anything… it takes the perfect conditions, and we have to continue to give to that idea of it being a perfect condition in this world."
Even Gore looked slightly confused, but he said: "The purpose is to have a billion voices with one message, to demand climate action now."
Williams has long been an outspoken campaigner against climate change. "You would have pundits and comedians who didn’t understand global warming," he said of playing Live Earth in Brazil in 2007, "and we were often ridiculed. We wanted to do something very different this time."
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