1) Coal is seeing a dramatic decline! The decrease in electricity generated by coal in 2015 was four times the increase in renewable (wind+solar) electricity generated. In fact, it was more than all other electricity increases combined. This is great for the environment, and not just from a carbon perspective, also from an ash and air pollution perspective. (But unfortunately bad for the areas where coal mining is the sole economic driver)
2) The total amount of electricity generated actually declined significantly (~5%) in 2015. Since we're not seeing a dramatic economic crash, does this point to efficiency gains, weather, or something else? Hopefully, we'll begin realizing more 'negawatts' - the most efficient watt-hour of electricity is the one that is never produced.
3) From a PV perspective, I live in an area attractive to solar power both physically and economically, yet only a handful of my neighbors have installed solar panels. There's still a LOT of room to grow!