Lester R. Brown is a person who cares a lot about the environment and wants to make sure that the Earth stays healthy and safe for all of us to live on.
For a long time, many people didn't really think about how our actions were affecting the planet. We would do things like cut down trees, drive cars that create pollution, and use too much water without really thinking about how it was bad for the Earth.
But Lester R. Brown noticed all of these things happening and knew that we needed to make some changes. He started writing about the environment and talking to people about how we can take better care of the Earth.
Lester R. Brown thinks that it's really important for us to use renewable energy sources like wind and solar power instead of using non-renewable energy sources like oil and gas. He also thinks that we need to be more careful about how we use resources like water and land so that they don't run out.
Lester R. Brown is a really important person in the world of environmentalism because he's helped to raise awareness and make people care about the Earth.