The global climate crisis has brought environmental concern to the top level of international politics. This book gives an overview of the most important international regimes aimed at solving the world's environmental problems, including climate change, pollution to air and water, and loss of biological diversity. The authors describe the problems, the international cooperative mechanisms and their effects, globally and in Norway. They also discuss why the effects vary between different functional fields, and how the regimes can be improved: How can reality be brought closer to the ideals?