The memes of the climate

Fusion is all but guaranteed to work eventually. If a breakthrough was made today that makes it commercialy viable, it would be ten years before we see a reactor putting power on the grid.

It's not something we want to hang our hopes on. ITER will probably work if nothing else gets there first, but we need to look at other things long before that comes online. There's no reason to wait and every reason to go full speed on what we have.