"If people cannot find clean water for drinking, wood for shelter and energy, or land for crops, what are the chances that peace will be successful and durable? Very slim," says David Jensen of the UN Environment Programme (UNEP), who describes UNEP's activities in Afghanistan, Sudan, and other areas of conflict. "UNEP seeks to ensure that countries rebuilding from conflict identify the sustainable use of natural resources as a fundamental prerequisite and guiding principle of their reconstruction and recovery."