For the first time, Forbes is highlighting 50 superstar entrepreneurs, scientists, funders, policymakers and activists who are leading the charge to combat the climate crisis with real, tangible impact. T he science is indisputable. Decades of research confirm Earth’s climate is warming.

CO2 levels are unprecedented, catastrophic weather events are becoming more frequent and severe, and human activities, particularly the burning of fossil fuels, are the primary driver of the warming observed in the past century. The stakes are high, and the scientific consensus is clear: Without fast and significant action to address climate change, it will get worse—more extreme weather, food and water insecurity, mass displacement and public health crises. The need for real, demonstrable action is urgent.

Across the globe, leaders are taking bold steps and driving meaningful change. The climate crisis is a dire threat, but also an opportunity. For the first time, Forbes is spotlighting the entrepreneurs, scientists, philanthropists, investors, politicians and activists leading global efforts to combat the climate crisis.

The 50 honorees recognized as Forbes inaugural Sustainability Leaders span industries and disciplines while all demonstrating exceptional ambition, innovation, and recent, tangible impact that is both scalable and sustainable. No greenwashing allowed — we looked for people making a real difference in their field, whether that’s Forbes 30 Under 30 alumnus Gaurab Chak.