1.  Effective measures should be adopted in no time to sharply cut emissions of carbon dioxide, and there is no doubt that developed countries should take up "common" but more responsibilities.

2.  That is why developed countries in Western Europe and North America have the undeniably historical responsibility in cutting carbon dioxide emissions.

3.  With heavier burdens of large populations, developing countries should share less responsibility in cutting the emissions.

4.  It is exactly the time to sharply cut carbon dioxide emissions.

5.  Factories especially in China didn't assemble any facilities to cut pollution emission to pursue some interest in hand, which can be extremely dangerous when these factories are protected by local governments and even get permission to do that.