Harvard alumni can help solve our climate crisis and protect our environment. We are a volunteer-driven community of more than 3,000 Harvard alumni and affiliates who work to address our climate crisis and achieve a more sustainable and just world. Become a Member Today From pioneering new programs and initiatives to mentoring, there are many ways to get involved. Get Involved All Harvard alumni, staff, fellows, and other affiliates are welcome to serve as members. Become a Member Today