Botanist, National Geographic 33 changemaker, and National Geographic Explorer Benedetta Gori says modern agriculture grows too few crops, leaving it vulnerable to climate change and disease. Read more about her work: #NatGeo33#

Renowned botanist and Nat Geo Explorer Peter Raven, who turned a minor botanical garden in the U.S. heartland into an international research and conservation powerhouse, has died at 89 years old. Learn about his influence and impact:

High above Medellín, Colombia, botanist and #NatGeo33# changemaker Daniel Piedrahíta refuses to let any orchid go extinct. By cloning rare species and harvesting microscopic seeds by the millions, he’s safeguarding them for the future. Read more: