Electric Vehicles

Batteries are still less energy dense and portable than fossil fuels. I think this is easily navigated for private use - provide a wide charging infrastructure - but heavy industry is the harder problem to solve, but to match how fossil fuels are used and to change the opinions and expectations of those in charge.

A lot of remote sites rely on diesel or petrol generators, and I don't think there's an equivalent device to provide clean energy in both capacity and portability. I believe the only way to change industrial clean energy adoption is to make clean energy cheaper. Politicians won't tax fossil fuels (because it's political suicide in most economies), so we need more emerging technologies before we can get close to actual industry adoption.