I think the greatest challenge in environmentalism and the most rewarding challenge is trying to figure out how humans can meet their needs while protecting the environment.
我认为环境保护主义最大的挑战，也是最有价值的挑战是试图弄清楚人类如何在保护环境的同时满足他们的需求。
我认为环境保护主义最大的挑战，也是最有价值的挑战是试图弄清楚人类如何在保护环境的同时满足他们的需求。