Actress and climate campaigner Emma Thompson speaks to media at the start of the “People’s Climate March” demonstration in London

Actress Emma Thompson speaks to the media at the start of the “People’s Climate March” in central London September 21, 2014. The London march was one many held worldwide, ahead of the forthcoming U.N. Emergency summit on climate change. REUTERS/Luke MacGregor (BRITAIN – Tags: ENTERTAINMENT POLITICS ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY) – RTR4743F