Why do you think it would be hard to get elected on that platform?

To be clear I think you're right, but the reason I'd give is that people with financial interests in fossil fuels will spend their money on attacking you and boosting your opponent.

Nothing about the actual steps required seems that unpopular to me. Cleaner air, cheaper energy, better cars and busses? It only seems terrible if you believe the lies put out by the aforementioned fossil fuel interests.