In 2007, a year of “planetary emergency”, when global warming was widely recognized as the defining issue of our era, the Billion Tree Campaign came to symbolize the readiness of people everywhere to work to protect our climate and collective home. Inspired by the 2004 Nobel Peace Prize Laureate, Professor Wangari Maathai, the first United Nations global tree-planting campaign was met with more enthusiasm than anyone could have predicted. After its launch in November 2006, word of the Campaign spread rapidly and partners joined the initiative with remarkable speed. The original goal of gathering a billion pledges in one year was exceeded in just five months. The billionth tree was in the ground in November 2007. By the end of January 2008, nearly 2.38 billion trees had been pledged and more than 1.8 billion planted. This publication can introduce but a fraction of the energy and results inspired by the Campaign. It is intended to convey the range of partners moved to action: from children to giant corporations, from women’s groups to technocrats, dancers to diplomats, farmers to national government