Tens of thousands of people have gathered in central London for a march to demand that global leaders take urgent action to tackle climate change.
Environmental campaigners and charity leaders were joined by celebrities including actresses Emma Thompson and Vanessa Redgrave, singer Charlotte Church and fashion designer Vivienne Westwood as they called on politicians to agree on an ambitious new climate agreement.
World leaders from more than 50 countries are meeting in Paris for United Nations' talks to secure strong deals to curb rising temperatures and shift the world to 100% renewable energy.
Almost 2,500 events are taking place around this weekend, with London's expected to be the biggest.
An event planned in Paris was cancelled following the terror attacks two weeks ago, and campaigners instead placed thousands of pairs of shoes in the city's Place de la Republique - including a pair from the Pope - as a symbolic march.