Last year, Pentagon defense adviser Andrew Marshall issued a harsh warning of the consequences of climate change: mass chaos, national security crises and food shortages. If climate change occurs abruptly, the report declared, there could be a catastrophic breakdown in international security. Wars over access to food, water, and energy would likely break out between states. Even if climate change is more gradual, recent studies have argued that as many as one million plant and animal species could be rendered extinct by 2050 due to the effects of global warming.

Climate change is the most serious challenge facing the international community. In order to plan for a sustainable future