With the world more than 80 percent dependent on oil, coal, and natural gas to fuel vehicles, light and heat homes, and drive industry and agriculture, energy is essential for all aspects of human life.
Fresh water is unevenly distributed, in some areas drying up, and often disputed territory. Its availability drives economies and human behavior, often with repercussions for security.
Trends in land use, food supply and demand, and urbanization are driving instability in areas of strategic interest to the United States. Today, they are also reshaping international relations like never before.
Biodiversity loss and collapsing ecosystems can affect the long-term stability and growth trends, often for U.S. allies and countries of high strategic interest.