Bill Gates, the tech billionaire turned philanthropist, has been combating poverty, disease, and inequity around the world for decades. However, in recent years he has shifted focus and resources towards the climate crisis. Gates believes fighting climate change and fighting poverty are two sides of the same coin. Food, health and economic crises will last longer and become more severe as climate threats escalate; disproportionately impacting the most vulnerable communities. Surprisingly, Gates remains optimistic and believes the power of human ingenuity will win out with a technology-driven approach in both mitigation and adaptation. Graihagh Jackson sits down with Mr Gates to talk about his positive outlook and the billions he’s investing in tackling climate change. Email us: theclimatequestion@bbc.com Presenter: Graihagh Jackson Producer: Osman Iqbal Series Producer: Alex Lewis (+ Simon Watts) Editor: China Collins Sound Engineers: James Beard and Graham Puddifoot