For the environment of this planet to be protected international agreements like the Kyoto Protocol should be honoured by the major polluters. Developing countries should be given the technology to develop industry to the level of the developed world without producing as much pollution.
In general every country should develop effective and cheap methods of recycling. The price of recycling some products is more expensive and, therefore, less appealing to producers/industry. This is a major obstacle that must be overcome for us to be able to pass on to future generations a clean, safe environment.
Protecting the environment is not something nation states alone can do. International organistations from the EU to the UN have a role in encouraging states to cooperate in developing environmental policies that will not only enhance their region but the entire world.