Under promise and over deliver.

As a businessman, Trump knows that those are the rules. And as president that’s just what he did today in his inspirational speech about pulling out of the Paris climate agreement.

It was inspirational because it articulated better than any world leader has ever done before why environmentalism is in fact such a harmful creed.

Rather than get bogged down in the “science” of climate change — an elephant trap so arranged by climate alarmists to make anyone who disagrees with them look ignorant or “anti-science” — he cut to the chase and talked about the important stuff that hardly ever gets mentioned by all the other politicians, for some reason: the fact that the climate change industry is killing jobs.

He talked about “lost jobs; lower wages, shuttered factories.”

He listed what the effects of implementing the Paris Agreement would be, by 2040, on key sectors of the US economy:

Paper down 12 percent

Cement down 23 percent

Iron and steel down 38 per cent

Coal down 86 percent

It was simple and it was brilliant. Here was Trump talking to his voter base, feeling American workers’ pain and telling them [he didn’t actually say this but this was the message]: “I won’t abandon you. I won’t sell you down the river, whatever the global elite may want and however much they try to bully me. You people come before all this green crap.”

And it also has the virtue of being true. Sure the actual figures may be guesstimates, but there’s no question that the tenor of his argument is quite accurate: climate regulation like the Paris agreement makes energy more expensive, slows economic growth and kills jobs, especially in the heavy industrial and fossil fuel sectors.

This argument ought to be low hanging fruit to any half way intelligent politician: it’s such an obvious way of connecting with the workers. Yet Trump is the only one who has ever said it. And hearing him say it was a reminder of why it was that he won the presidential election. He connects with his people in a way that so many politicians just don’t.

Compare and contrast with the other world leaders: Merkel, May, Macron, Trudeau, Turnbull — not one of those charlatans dares tell the truth about the global climate change industry, that it’s a racket which achieves nothing but simply transfers wealth from Western nations to countries like India and China.

The other clever thing about that speech, of course, is that he’d kept us guessing to the last.

Me included.

I thought he was going to fudge it much more than he did; that he’d end up compromising to please Ivanka.

But with this speech on Paris, President Trump has delivered.

Just when even some of his fans were starting to doubt him, he has made his presidency great again.