Fossil carbon extraction needs to be halted. Worldwide. Close the coal mines, shut down the oil rigs.
Everything else is just rearranging the deck chairs on the Titanic. It's very, very simple: at the beginning of the Paleozoic era, atmospheric carbon was 20x higher than today, a level that the current biosphere cannot survive in. Gradually, over the next few hundred million years, that carbon was sequestered into the ground. We are now digging it back up and burning it, thus returning it to the atmosphere, within a span of decades. You can talk about LED lightbulbs and carbon credits till the cows come home, but the only thing that can halt this is preventing people from burning carbon that came from the ground - and the only way to stop that is to ban its extraction.
"But what will we do for energy?" Lots of things. We have options. Personally I'm a fan of the magic green rocks that give energy forever.
"But how will we power things that need high energy density / make plastics / lubricate my e-bike chain etc" - Oil. We can make it from anything carbon based. It's not even hard. We just have to stop digging it up and burning it.