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Just how bad will it get if the world fails to get to grips with climate change?On day two of the UN Climate Action Summit in New York, Justin Rowlatt speaks to David Wallace-Wells, author of the apocalyptic book Uninhabitable Earth, which lays out the dire predictions of climatologists for the coming decades if humanity continues to put ever more carbon dioxide into the atmosphere unabated.Yet despite the potentially terrifying outlook, it remains very difficult to motivate politicians and the public to take meaningful action to cut emissions. Why is that, and how might that change? Kelly Fielding is a social psychologist at the University of Queensland in Australia, and has some of the answers.Producer: Laurence Knight(Picture: Dead bumblebee from the cover of Uninhabitable Earth by David Wallace-Wells; Credit: FXseydlbast/Getty Images)

The Swedish teenage activist Greta Thunberg explains how she aims to get the world's governments gathered for the UN Climate Action Summit in New York to take meaningful action on global warming.Justin Rowlatt speaks to her about her ambitions for her transatlantic trip, and whether one person can really make that much of a difference. In order for her mission to succeed, it will mean rebuilding the global economy from the ground up, including the phasing out of most of the oil and gas industry. John Hofmeister, the former president of Shell's US subsidiary, claims the big oil companies are ready and willing to do their part, if the politicians will only give them the green light.Producer: Laurence Knight(Picture: Greta Thunberg testifies at the US Congress in Washington DC; Credit: Alex Wong/Getty Images)

What next for the social media giant? Jane Wakefield speaks to one former mentor of Mark Zuckerberg, and a British member of parliament about what changes Facebook needs to make after data scandals and concerns over its power.(Photo: Facebook logo, Credit: Getty Images)