Topics to impress this week. 1. BHP Billiton at climate change action coalface BHP Billiton, the world’s biggest miner, plans to withdraw from the World Coal Association in support of action against climate change. The move is something of a surprise, considering the firm derived just under 20% of its total revenue in the year to June from coal. The company says differences over climate and energy policies are behind the withdrawal. It supports tackling climate change by encouraging the use of renewable energy and cleaner technologies. It will also review its membership of the US Chamber of Commerce in light of President Donald Trump’s decision to withdraw from the Paris climate accord. 2. Uber hailed a cab? It’s a million-dollar question that will now be left to the courts to answer: is the world’s most valuable start-up a taxi company? Uber insists that it is a tech platform that connects passengers with drivers, not a transport firm, which means it isn’t subject to the same rules...

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