Greta, Merkel, big oil and a tax truce - Davos Thursday highlights

U.S. Treasury Secretary Steven Mnuchin told Greta Thunberg she should study economics, a jibe which prompted the climate activist to say she didn't need a degree to know the world was not meeting its climate targets. There are signs U.S. President Donald Trump is starting to engage more seriously on climate change and listening to the concerns of corporations, the European Commission's vice-president and head of its 'Green Deal' said. Diversification is crucial to ensuring a country's security in the rollout of 5G mobile technology and shunning one supplier altogether risks being counterproductive, German Chancellor Angela Merkel said.

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