In this final episode for the TEDxMerdekaSquare series, environmentalist Adrian Yeo shares five pointers on how to kick start grassroots movement to address climate change and environmental issues effectively. Sharing the stage is epidemiologist, Leon Ochiai. He thinks that while the most important breakthroughs over the course of vaccine development are done in the lab, the crucial element to saving lives is ensuring accessibility or the delivery of the right vaccines to the right people.