"global carbon tax and a global carbon emission trading scheme"
I haven't read the protocol! The above it seems is an important part thereof I understand, for Johny is investigating his own way of implementing it. The protocol was never intended to be the end of all solutions, rather a beginning.
If we believe at all in market forces surely it's a start, maybe a proof that the the market is what so many proclaim it to be, whether we sign or not will mean we are in the discussion or not.
China and India I presume have priorities and without the investment from the world to change those priorities they too will stay out of the discussion.
Carbon trading is the markets answer, a side issue is clean air.

What to believe in a world of obfuscation?
fluff