The issue is that we've relied on hydrocarbons for so long that switching off means significant change at basically every level of the stack. Let's take the transition to EV vehicles as an example. To do this you need to build charging infrastructure along common and uncommon routes. Do all houses need home chargers now? What about people who use street parking only? To make the switch worthwhile you need the utilities to switch the power base to renewables. Oh and with the switch, we're now more than 2xing the amount of electricity we need to generate. So now we need to upgrade our transmission lines to carry a lot more energy. And the grid in general needs to be smarter since renewables aren't consistent in energy output. EVs need less maintenance but it's more specialized so now we need to retrain all the mechanics. Oh and how do we do this with affordable prices?

We have to make a lot of changes across virtually the entire economy including equipment/factories etc that have lifespans in 30, 50,100 years. There are major questions about how fast we can accelerate the timelines as we basically reinvent ourselves