Owh it really will be. Obama spent YEARS trying to get the Paris accord together and it's not going to go down so easily. Not after the confirmation by EU, India, China and the rest of them. There's political incentive for them to stay from the way i see it.

of course, Really it's just bunch of Aloof-suitpeoples arguing rhetorics.. it really comes down to the common people and businesses to exact change and save the planet. 
Think about it, when Electric cars finally become the big hit and companies everywhere are making their own Tesla-copycat, would Big Oil still survive?

Being the edgy people we are (you're on Steemit, dont tell you're not.. hahahaha), As soon as we turn our hate towards Big Oil, Big Food, Big Corps... into action, start using our own electricity through solar, start eating our own food through edible garden.. we're already making the world a better place.

That goes without saying using cryptocurrencies to piss at Big Banks.. TAKE THAT!!!LOL

Well actually even the USA itself. It's only President Trump and the Federal Government that will withdraw, technically. But as we see, State Governors like Governor Schwarzenegger will continue on with their state policy to reduce carbon emission. 

If there is one thing and one thing only that all humanity on earth should unite and stand for right now, it's climate change.

Post script edit: Forgive me if i sound like ranting, i'm really not. I'm just looking at this with all the info i have (could be wrong) being as deductive as possible (again, could be wrong).

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 I'm not an American nor am I politician, please dont take this at face value. hehehe..

But from what i surmise, President Obama did what he did because of the ongoing "strike" Congress had on him. Remember how Congress rejected every Affordable Healthcare Act proposal presented by President Obama until it became the half-decent shit Obamacare is?

So maybe his line-of-thought at the time was that climate was more important than politics (I'm just guessing here!!!) and went ahead with it. Which i agree with your saying that he worked on it with almost a altruistic behavior. 

So for President Trump, he might do that to go right by Congress. But doing that has caused SUCH A BACKLASH on him, he got so much hate for it and i'm starting to feel some of it isn't even necessary at all. but what analysis has been saying is that he effectively ceded Global Power by rights of being Climate Conservation Leader for the benefit of businesses and taxpayers in cost saved.

But there are better ways to save taxpayers money and jobs IMHO. Greentech is a booming industry. Solar itself supports more jobs now than Coal is and numbers continue to rise. And dont get me started on Military, I know the US has to keep Its Military at top notch levels by spending one-fifth of Federal Budget, which is something akin to 12 thousand dollars of taxpayer money PER AMERICAN. I totally understand it's to keep America as a Global Power but then wouldn't it be ironic because President Trump effectively ceded some American Global Power through the withdrawal.

I'm just being hypothetical... again.. i can totally be wrong and i understand that.