To commemorate the 100th anniversary of President Theodore Roosevelt’s groundbreaking 1908 Conference of Governors (that launched the modern conservation movement), we organized a Governors’ Conference on Climate Change on April 17 and 18, 2008. This conference recognized those governors demonstrating global leadership on climate change and also provided a forum to chart a forward path on state, national, and international action. Several provincial leaders from other countries also participated, along with many state environmental agency leaders. The meeting concluded with a Governors’ Declaration on Climate Change signed by 18 governors.