was not reaching an agreement with the United states over Carbon dioxide emmission reductions. China's problem was Obama's demands of verification that would be required to ensure country's were abiding by their promises made at Copenhagen. It is a completly separate issue from the proposals to move towards sanctions to prevent Iran achieving parity with Israel.
Australian police arrest 5 over shooting 'linked to terrorism' (Reuters)
from the article: Diplomats: Weak climate deal is harbinger of failure on Iran