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India's hospitals are overwhelmed with Covid patients and the morgues can barely cope with the number of dead. We hear from a doctor and look at why the country is seeing such an exponential rise in cases. We have a report from Sao Paulo about the rollout of a vaccination programme which people hope will be a turning point in the fight against the virus. And US President Joe Biden hosts an international climate change conference today - we talk to one of the scientists who say that after the pullout from agreements under Donald Trump, it is time to take action.