Climate change poses the greatest threat to the well-being of future generations. The science is clear. It is time to act! Americans need leaders who will stand up to the fossil fuel industry and embrace green energy. The technology that harnesses our renewable resources is becoming more efficient and effective. Renewable resources, such as sunlight and wind, are environmentally sustainable, and they are emerging as cheaper options than nonrenewable fossil fuels. Dr. Gill believes that all public policy questions should follow the Iroquois tribe "Seventh Generation Principle": the decisions we make today should result in a sustainable world seven generations into the future.