How China became a global auto giant

<p>From the BBC World Service: China is now the world&#8217;s biggest exporter of cars, helped by a massive growth in electric vehicle production. We look at how it caught up to more established brands. Plus, Thailand&#8217;s radical decriminalization of cannabis last year has led to a boom in marijuana-related businesses. But a recent election could lead to a U-turn in the way the country treats the drug.</p>