Nature: This week China budged. Depending on one`s perspective, it wasn`t much of a concession. The country agreed, in essence, to do what it and everybody else had already agreed to do back in 2007: accelerate the phasing out of a common class of ozone-eating refrigerants that double as powerful greenhouse gases. But rather than haggling over prices each step of the way, China made it simple and cut a single deal -- worth up to US$385 million -- to eliminate hydrochlorofluorocarbons (HCFCs) between now...