► Subscribe to the Financial Times on YouTube: bit.ly/FTimeSubs Six European energy companies have asked the UN to draw up a carbon tax. Lex’s Oliver Ralph and Alan Livsey ask why they would do this. ► FT Global Economy: bit.ly/1J5mmqH ► Lex: bit.ly/1I14JZF ► Olam Chief Calls For Carbon Pricing to Curb Emissions: bit.ly/1BsqSOV