Many environmental problems will be easier to address if world population peaks at 8 billion rather than 11 billion. The good news: there is already a global consensus on how to slow population growth, with programs that improve human well-being at very little cost.

A new advocacy guide by Population Action International and the Population Justice Project breaks down population and environment connections in clear, accessible language and demonstrates how universal access to family planning is an important aspect of environmental sustainability. The guide provides talking points on population and the environment and tips on “words to watch” for those new to population and reproductive health issues.