World leaders pledge to tackle effects of the pandemic

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The 21 leaders of the Asia-Pacific Economic Cooperation have met today (albeit virtually) to pledge urgent action to tackle the health and economic effects of the Covid 19 pandemic. Eric Martin of Bloomberg News in Washington DC gives us more context about what was discussed. China has launched the world's largest carbon trading market in a bid to curb emissions. The BBC's Andrew Walker explains how such schemes work, and we ask Sha Hua of the Wall Street Journal whether the new market is likely to achieve its goal. Also in the programme, it's 40 years since what we now call HIV and AIDS were first recorded in the United States. The UN had hoped to eliminate the disease by 2030, though the target appears to be slipping. The BBC's Lucy Burton assesses progress so far, and finds out where help might come from. (Picture: New Zealand prime minister Jacinda Ardern. Picture credit: Getty Images.)