(Barely brushes political stuff, doesn't invite argument about it. It won't hurt my feelings to have it removed.)
We are headed toward a Maunder minimum.
Maunder minimums are periods of minimum sunspot activity accompanied by reduced energy output from the sun, and thus cooler temperatures on Earth. A recent Maunder minimum, The Little Ice Age, lasted from ~1300-1800. Among other things, it greatly reduced the amount of food produced in the world, led to widespread malnutrition, which in turn magnified the effects of the bubonic plague. Large negative effects like this on human civilization for 500 years.
Speaking of ice ages, we are in an ice age, the Quaternary Glaciation, and have been for at least 2 million years. We started an interglacial period 11,000 years ago. It won't last forever.
We are predicted to have fusion in 50-100 years, and almost certainly in 200. Energy will be virtually unlimited, and virtually free. Very low cost, anyway. We will be able to do things we can do now, but don't because they're not energy efficient. Like desalinate ocean water, make as much of any element we want. We can do awesome but energy inefficient chemistry on as large a scale as we want.
(Brushing casually past politics.) Assume global warming is real and caused by CO2.
My Suggestion For The Near Future:
We need, absolutely need, to start pumping as much CO2 into the atmosphere as we possibly can. The Maunder minimum is coming, and we have no idea how long it will last. The only responsible course of action is to plan for the worst and try to mitigate the effects as much as possible. Pump that CO2! Burn that coal, tear down those solar panels and those windmills! We need massive amounts of CO2 pumped into the air starting yesterday! We need to stop selfishly conserving energy. We need to drill and pump and burn.
But wait, I hear you saying. What if the Maunder minimum isn't very bad at all and we pump too much CO2 into the atmosphere? We can sequester it! For example, we can combine CO2 and water to form hydrocarbons. That is carbon-neutral fossil fuels, for anybody keeping score.
Before we sequester, though, we have to think about the return of the glaciers. Without global warming, the glaciers will return in ~15,000 years. With global warming, it's ~35,000.
So. Think about future generations and go out and burn a tire in your backyard today!