We have had twenty years of international conferences on what to do about the global environmental crisis, and some commentators say absolutely nothing has been achieved. This shows that:

• A. There is a complete lack of international commitment to positive action
• B. It is very difficult to devise appropriate policies
• C. The environmental crisis is only one of the issues that nations negotiate about, and agreement on environmental issues has to be compatible with agreements on other issues, such as trade
• D. There is no agreement on the environmental issues facing the global community