Policy won't change unless the two party gridlock does. Even when the Dems take power (like now), nothing really happens. It's just lip service at best.
Republicans are in favor of dismantling and eliminating the EPA and clean energy initiatives, for instance. Democrats aren’t great either, but Republican policies are measurably at least an order of magnitude worse.
Every single election cycle we have this discussion. "Well, at least the Dems are better than the Republicans. They're the best we can get." It's not enough. Hasn't been enough for a long time.