Climate change demonstrators march to demand curbs to carbon pollution in London on November 29, 2015 on the eve of the climate summit in Paris. Oscar-winner Emma Thompson called on world leaders to grab the "historic" opportunity to reach a deal on tackling climate change as she joined tens of thousands of environmental protesters in London today. AFP PHOTO / LEON NEAL / AFP / LEON NEAL (Photo credit should read LEON NEAL/AFP via Getty Images)
