New Colombian right-wing president sworn in

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Colombia's new right-wing president has been sworn in and vows to improve the country's security. Also in today's programme: An appeals court halts the construction of Trump’s $400m White House ballroom; and, one country's new strategy to make tourism more sustainable. Presenter Julian Worricker is joined by Ella Gilbert, a UK based climate scientist and broadcaster and Michal Ovadek, a lecturer in European politics and policy at University College London. (Photo: Right-wing De La Espriella is sworn in as Colombia's new president, in Cali. 7 Aug . Credit: Luisa Gonzalez/Reuters)