Bill Gates explains why he cares so deeply about climate change and what makes him optimistic that the world can avoid the most dire effects of the climate crisis. Gates says, We can work on a local, national, and global level to build the technologies, businesses, and industries to avoid the worst impacts of climate change. His interest in climate change is a natural outgrowth of the efforts by his foundation to reduce poverty and disease. Climate change, according to Gates, will have the biggest impact on the people who have done the least to cause it. As a technologist, he has seen firsthand how innovation can change the world. By investing in research, inventing new technologies, and by deploying them quickly at large scale, Gates believes climate change can be addressed in meaningful ways.