Removing coal as an energy generation source in the west is a step in the right direction, but without real enforcement mechanisms against China, India, and other hyper-polluters, none of our efforts matter, ultimately. It's a nihilistic view, but unfortunately it's also the reality. Toothless agreements like the PCA, which don't even see China or India setting a firm date on when their "peak carbon" will be (after which their emissions start decreasing) simply aren't going to be enough if we want earth to be a hospitable planet for human life in 2100.