China launches carbon trading market - a podcast by BBC World Service

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. Plus, new research indicates that not attending gigs and music festivals can prevent people discovering new music. Ricky Wilson is lead singer of the British indie rock band the Kaiser Chiefs, and gives us his perspective.

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