Yes, the majority of emissions reduced during the 8 years under Obama were because fracking drove down the cost of natural gas below the cost of coal. The market drove a reduction in a coal usage in favor of fracked natural gas. But of course, that's what happens when the only thing you control for is the one variable that makes headlines.

Speaking of which, during the first 4 years of Obama's fracking boom, no one was measuring the leaks, and leaks from natural gas wells are methane, which traps 8,600% of the energy that CO2 does. They didn't even start trying to fix this until 2016, and of course those fixes were easily rolled back by Trump, because the Ds can always expand the harm, but they can't ever seem to contain it.