This document discusses the need to view 21st century education through a sustainability lens. It explores how connecting 21st century education discussions with Education for Sustainable Development (ESD) can help develop a vision of education that prepares students for environmental, social and economic challenges and enables them to help create a more sustainable future and economy. While many emphasize 21st century skills for employability, continuing on the current development path is unsustainable, requiring more than 2.3 planets by 2050. ESD emphasizes strategic, futures thinking to allow humans to live sustainably on Earth.