Sir Richard Branson is at it again. After making headlines last year for pledging to invest $3 billion in renewable energy technologies, he’s upped the ante on curbing climate change by offering a $25 million prize to whoever comes up with the best way of removing significant amounts of carbon dioxide from the atmosphere. Announced in London alongside former US Vice President and climate campaigner Al Gore, the Earth Challenge Prize will be overseen by a panel of judges, including James Lovelock and NASA scientist James Hansen (whom we mentioned here), who will be looking for a method that will remove at least one billion tons of carbon dioxide per year from…

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