The World Trade Organization (WTO) regulates trade issues and trade-related aspects of non-trade issues. One such non-trade issue is the environment. The WTO has shown a desire to regulate trade in a more comprehensive way encompassing non-trade values. The enthusiasm for environmental protection was not so pronounced during the reign of the General Agreement on Tariffs and Trade (GATT). The interaction between trade and climate change has received a lot of attention. What would be the response of the WTO if it were to decide on the compatibility of laws passed by developed countries to respond to climate change but which have implications for international trade? The response cannot be given in advance. It is only possible to analyse the laws of the developed countries and speculate on the response of the WTO.