"The need for a comprehensive understanding of the world's natural resources and human behavior in order to develop sustainable solutions for the world's problems is the key to a sustainable future." - Dr. John M. Kline, Environmental Scientist at the University of California, Berkeley. The United States is the largest contributor to global warming, and the world's largest polluter, and is at the forefront of the global climate crisis. The United States is responsible for more than a quarter of the global greenhouse gas emissions, and is at the forefront of the global climate crisis. The United States is responsible for more than a quarter of the global greenhouse gas emissions, and is at the forefront of the global climate crisis. The United States is responsible for more than a quarter of the global greenhouse gas emissions, and is at the forefront of the global climate crisis. The United States is responsible for more than a quarter of the global greenhouse gas emissions, and is at the forefront of the global climate crisis. The United States is
