Adam Vaughan: Saturday 11 March 2017 15.59 GMT
hen Shell sold most of its Canadian tar sands operations last week, the Anglo-Dutch oil company took a modest step towards making good on its promise to be part of the solution on global warming, rather than the problem. But the $7.25bn (£6bn) sale of the majority of its tar sands assets to an independent Canadian oil company is less about the company cleaning up its image than about cleaning up its debt.