How is the Amazon going to die? Don't plants kinda like co2? Do you think it'll just become a desert somehow or something?

Deforestation causes more extreme weather like floods and landslides which also remove fertile soil, and trees don't regenerate quickly enough to prevent that from happening. And global warming also increases weather instability at a rate nature can't adapt to.

So even the existing forests will have a harder time.

Plants need a lot of things, not just CO2; what they are limited by varies from case to case, and conversion to farmland can cause permanent damage which may indeed turn it into a desert.

Fortunately, careful manipulation can reverse desertification.