*Bill McKibben* is a prominent environmentalist known for his research on **climate policy**. As the founder of 350.org, he has been a leading voice in the climate change movement, advocating for reducing atmospheric CO2 levels to combat global warming. His writings, including *The End of Nature*, raise awareness about ecological issues and urge society to reevaluate its relationship with the planet. McKibben's activism extends beyond advocacy, influencing climate policy on both local and global scales through grassroots campaigning and public engagement.