As a granddaughter of the late Jacques Cousteau, the pioneering undersea explorer and researcher, Alexandra Cousteau was raised understanding the urgency of protecting the ocean. “My grandfather taught me to dive when I was seven, so this is all very much part of who I am,” she says. In 2018, Cousteau cofounded Oceans 2050, a nonprofit seeking to restore marine life over the next 30 years by engaging the public in projects that are accessible, concrete, and scalable. “Half of the fish that used to swim in the oceans my grandfather explored just 60, 70 years ago are gone,” she explains, adding that climate change, coral bleaching, over-fishing, and plastic waste are largely to blame. Recently, Oceans 2050 launched a new public search engine, blue, which donates all revenue toward…