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Scientists have expressed optimism that the targets of the Paris climate agreement are coming within reach. As Covid-19 continues to surge in the US, Doctor Fauci, the director of the National Institute of Allergy and Infectious Diseases and a member of the current administration’s pandemic task force talks to us about vaccination and the cultural challenges of selling science. And what's going to happen to all that discarded PPE… we speak to an Indian inventor who's making bricks out of it, to build.