Today, representatives from 47 nations and countless civil society organizations are gathering at the United Nations in New York for the 47th Commission on Population and Development (CPD). The purpose of this year’s CPD is to review 20 years of progress since the milestone International Conference on Population and Development (ICPD), held in Cairo, Egypt, in 1994.

So, why should you care about a conference that happened 20 years ago? And what lessons can we take from Cairo as the world determines its post-2015 development agenda? Watch the video above, from Planned Parenthood Global, to see how the ICPD changed the conversation, and why it still matters for the health and rights of today’s women and girls.