But there are some things about EVs that cannot be overcome because science. Like the fact that gasoline holds far more energy for its weight than batteries ever can.

That's true for our current batteries. Where does science say we'll never be able to make batteries with a higher energy density than fossil fuels?

This is merely one of the limitations I mentioned manufacturers need to work on.

We’d have to add a lot of power to our grid and EVERY power source requires some kind of environmental cost, the question is only how much.

Right, which is why we need to build out renewable capacity as we go. By forcing EVs onto the market it would spur home owners to add solar panels to their roofs. The rise in demand would increase new production. Again, that's why it's a long term phase out rather than cutting over suddenly.

Also it's far more efficient to generate power in large facilities rather than in lots of little ones. It's better to have a few larger power generation plants rather than every car having its own. It's the economy of scale. One generator that produces enough power for 100 vehicles is more efficient than 100 generators powering one vehicle each. Transmission distance lowers that efficiency, so hopefully those sources can be clean and local to where they're being used.