1.   An international arbiter found that one country could not pollute another without being held liable for damages.

2.   Opponents say such programs give credit for doing nothing and would mean countries could pollute more than they otherwise would be allowed.

3.   Opponents say such programs give credit for doing nothing and would mean countries could pollute more than they otherwise would have been allowed to.

4.   The first deadline for that agreement is less than a decade away and industrialized countries are still polluting more.