@Finn dAbuzz,
In 2013, if Obama had taken all of the political capital that he wasted in a fruitless temper tantrum against the NRA, and instead used that political capital pursuing climate change legislation, he would have succeeded.
And with successful major legislation in Obama's second term, Hillary would have easily won the 2016 election.
On the other hand, Obama did overrule the Left and start building a handful of nuclear reactors. That will help a little bit on the climate front.
Although that small positive can perhaps be offset by the negative of his opposition to pipelines.