Roger-Mark De Souza

Roger-Mark De Souza is the vice president for research and director of the climate program at Population Action International in Washington, D.C. Previously he worked at the Sierra Club, Population Reference Bureau, and the World Resources Institute.

  • 7 Billion: What to expect when you’re expanding—a special series

    Talking to my son about sex and sustainability

    “Are we going to talk about sex again?!” screamed my 12-year-old son. I had just sat down with him to have one of our father-son talks.