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At the Kyoto conference on global warming in December 1997，it became abundantly
clear how complex it has become to work out international agreements relating to the environment
because of economic concerns unique to each country. It is no longer enough to try to forbid certain
activities or to reduce emissions of certain substances. The global challenges of the interlink between
the environment and development increasing bring us to the core of the economic life of states.
During the late 1980s we were able，through international agreements，to make deep cuts in
emissions harmful to the ozone layer. These reductions were made possible because substitutions
had been found for many of the harmful chemicals and，more important，because the harmful
substances could be replaced without negative effects on employment and the economies of states.
Although the threat of global warming has been known to the world for decades and all
countries and leaders agree that we need to deal with the problem，we also know that the effects
of measures，especially harsh measures taken in some countries，would be nullified(抵消)if other
countries do not control their emissions. Whereas the UN team on climate change has found that the
emissions of carbon dioxide would have to be cut globally by 60% to stabilize the content of CO，
in the atmosphere，this path is not feasible for several reasons. Such deep cuts would cause a
breakdown of the world economy. Important and populous(人口众多的)low-or medium-income
countries are not yet willing to undertake legal commitments about their energy uses. In addition，
the state of world technology would not yet permit us to make such a big leap.
We must，however，find a solution to the threat of global warming early in the 21st century.
