And how is it not worth it? You said it yourself. It was non-biding, no enforcement, goals where self imposed and the US government still didn't want to take part.
What kind of message is that sending?
What kind of message is that sending?
If the US creates an alternative to the Paris Agreement that has more teeth, there might be an opportunity cost. Until then, this is the best thing we have.
The message being sent here is, "in the global coordination problem of climate change, I'm the defector and the freeloader, and I need to be coerced to take part".