Chemicals and waste play important roles in society and the economy but can also harm human health and the environment if not properly managed. A third of the world's food is wasted every year, totaling about 1.3 billion tons. The United Nations aims to minimize the adverse effects of chemicals on human health and the environment by 2020. To achieve this, UNEP is working with partners to build countries' capacity and policies for sound chemicals and waste management through increasing scientific knowledge and tools.