【单选题】Which of the following is NOT a reason why it will not make much of a difference even if every country reaches their proclaimed targets?
A.
The harmful gases are building up so much in the atmosphere that it is impossible to do anything about it.
B.
Some of the world’s biggest polluters are not part of the Protocol in terms of having to reduce their emissions.
C.
It is tough to reduce the harmful gases by 60 percent to stabilize the atmosphere.