Climate change is the defining issue of our time, and we are at a critical moment. Rising temperatures are already having a tangible impact on the global economy, on ecosystems and on society as a whole. The International Energy Agency estimates that investment in clean energy alone must reach USD 4 trillion annually by 20301 if we are to achieve net zero by 2050 and prevent catastrophic changes to health, livelihoods, water supply, food security, human security and economies.