When Obama left office, the US was well on its way to making its goals too. With the vote on methane and the changes to technology that have occurred because there was a world wide effort on this likely will mean that the US, while clearly not leading is on a better path than would have been predicted before Obama's Presidency. In some ways, Trump being in President makes the effort the US put in to the Paris accords and the agreements that led up to it more important. I suspect the reason he has not yet "ripped up" the agreement is that some in his administration see that it would leave us behind ... and nearly alone.
Reading the accounts from Paris, one thing was very clear - the US for decades has been a problem - not a leader to a solution - as have India and China. The Paris agreement was very very carefully crafted to not need Senate ratification, yet to create a signal to the market that would invigorate clean technology. That it succeeded is remarkable. It is worth noting that even in 2012, when Kerry spoke to Obama about becoming SoS, mentioning he wanted the environment and a climate change deal to be his signature issue - as women's and children's issues were for Clinton, he was cautioned that there was not much optimism about any diplomatic gain on those issues. (Obama's efforts were mostly executive orders to make the US greener)
Though I would assume that Kerry never thought the US would pull away itself, the design is very robust and each country works towards its own goals. Not to mention, US industry, some big cities , states (especially CA) and regions are continuing their efforts. Given that these areas might represent half the country, we could possibly still meet our goals - especially if a Democrat wins in 2020.
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