On the last day of last December's climate summit in Paris, German environment minister Barbara Hendricks could be seen walking in the first row of a pack of climate negotiators.
As the group of ministers and envoys, who had banded together as the so-called High Ambition Coalition, headed towards the plenary hall, they were all smiling and joking in the expectation of a binding deal to limit global warming.
But privately, Hen...
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