>Especially when solar, hydro, and wind are getting cheaper at faster rates than carbon based energy sources, and they have less negative externalities too boot
Solar is the future but your inclusion of wind shows you don't know what you're talking about.
Forget, for a second, that wind and solar, together, are responsible for something like 1% of energy generation and that the rest of the "renewables" are things like "biomass", which actually include the burning of human shit.
Wind, from a technical and physical standpoint, does not work. The maximum amount of kinetic energy that can be taken out of wind, by a turbine, in a theoretical situation involving infinite blades and no drag, is 59.3%, according to Betz's law. At peak performance, real-world turbines achieve 75-80% of this limit. There is basically nowhere to go, in terms improving energy generation. This is it.
So, to cover just new global energy demand, not existing but just new, would require you to cover a landmass the size of russia in wind turbines by, iirc, 2050.
It is also extremely harmful, from the point of view of "negative externalities". The construction of the steel requires a lot of coal, for the carbon content. The concrete also generates a lot of carbon (I don't think this part is harmful but, from your perspective, it is). And the precious metal mining is concentrated in certain parts of the world, like Mongolia, and creates toxic waste.
The 3 sources you listed might be getting "cheaper at faster rates" than carbon based energy sources but that's because carbon based sources have been refined for 150 years. Either way, they're still multiple times more expensive. And you simply will not be able to run a modern society until the energy density is at least comparable to oil, gas and coal, which it is nowhere near.
cont'd