ecologist

noun2

1. •
   A scholar of ecology.

   • Ecologists say the months of intense and unprecedented fires will almost certainly push several species to extinction. — 2020
2. •
   An environmentalist (one who advocates for the protection of the environment).

   • Protest actions of this type served to take debate, and the Basque ecologists, onto the street and to encourage people to carry out principled actions such as the eco-sabotage at Itoiz. — 2003