If you set a goal, and fail to meet it, you failed to meet it. We're not even going to get close to these goals.
The notion it is at all rational to talk about cutting emissions in half by 2030 should just stop being part of any conversation. We should consider what is going to happen as a result and how to mitigate that.
I'd like to lose 30 pounds. If I tried and lost 10, it would be a something. We're looking at maybe losing a pound, at best.
It really is that bad, despite the trillions we likely will throw at the problem.