Which international agreement did President Bush choose not to join?

President Bush chose not to join the Kyoto Protocol, which aimed to combat climate change by reducing greenhouse gas emissions. The main reason for the U.S. withdrawal from the Kyoto Protocol was the belief that it would harm the U.S. economy and that it placed an unfair burden on industrialized countries while exempting developing nations from mandatory emissions reductions. Under Bush's administration, the U.S. maintained that the treaty did not adequately address the issue of global warming and that it could negatively impact economic growth, particularly in industries reliant on fossil fuels. This decision was significant in the context of climate change discussions and showcased the ongoing debate over environmental policy and economic interests.

The other international agreements listed do not fall under the same context of environmental regulation. The Paris Agreement, which succeeded the Kyoto Protocol, was entered into later, the Rio Summit focused on sustainable development, and the World Trade Organization is primarily focused on trade agreements rather than environmental protocols.