This reasoning is absurd in every way! Besides assuming China is an enemy of the US - what does that even mean?
Let me illustrate how ridiculous this reasoning is: "North Korea wants to prevent rampant global warming, North Korea is an enemy of the US, the US wants to...?"
Ever hear the enemy of my enemy is my friend? If the enemy is instability, the US and China may have a shared goal and cooperate (or at least not sabotage each other on that issue).
Let me illustrate how ridiculous this reasoning is: "North Korea wants to prevent rampant global warming, North Korea is an enemy of the US, the US wants to...?"