The 19th Conference of Parties to the United Nations Framework Convention on Climate Change (UNFCCC COP19) will be an important one: not only must negotiators make substantial progress toward establishing the framework for the post-2015 climate change agreement, but they must continue to implement commitments already made – including on gender. Progress in understanding the intrinsic nature of advancing gender equality as prerequisite to sustainable development – and the transformative co-benefits each can provide to the other – has been profound, and yet ensuring that gender equality issues are rooted in the architecture for the post-2015 climate change regime is critical for COP19, as well as COP20. Beyond global negotiations, of course, interpreting those international mandates for national implementation will be crucial; fortunately, the IUCN Global Gender Office (GGO) is poised to support countries through this process, as it has begun to do in over a dozen countries already. Countries will also know how they score on implementation when IUCN launches at COP19 its newest innovation: the first-ever Environment and Gender Index (EGI).