The Rio De Janeiro and Kyoto Meetings on Global Warming

The Rio de Janeiro and Kyoto meetings on global warming demonstrate that

A) environmental problems are difficult to address without support from leading industrial states.
B) the concept of global warming has been proven to be at worst a hoax,at best simply a mistake.
C) the international community as a whole has no real interest in environmental issues.
D) global warming is a reality,but it is only a significant problem for the less developed world.
E) Western nations are ready and willing to pay the costs of dealing with pollution on a global level.