Rex Tillerson, until very recently the CEO of the world's largest private oil company and a close chum of Russian President Vladimir Putin, is now the US secretary of state. This is not some ham-handed satire or lurid dystopian novel. It's real life.
This makes Tillerson's views on climate change a matter of great interest. Most countries in the world send their minister of the environment (the equivalent of our EPA administrator) to represent them at international climate talks. The US is different — we send our minister of international affairs, i.e., our secretary of state.
That means international climate agreements — the big one signed in Paris as well as bi- and multi-lateral deals with China and other countries — are on Tillerson's plate. For most countries who deal with the US, he will represent America's disposition toward climate action.
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In a normal world, this would mean that he carries out his president's agenda. But President Donald Trump's thoughts and plans on climate change are, like most of his thoughts and plans, opaque. They might not exist at all. He seems to take whatever perspective is taken by whoever he talked to last.
Suffice to say, Tillerson is likely to have more influence than your average secretary. (Though on this, as on all matters Trump, we are all guessing.)