sentence: Some people call themselves 'environmentalists'.
sentences_before: In biology and ecology the environment is all of the natural materials and living things, including sunlight. This is also called the 'natural environment'.
sentences_after: These people think that harmony with the environment is important. The important things in the environment that we value are called natural resources. For example fish, sunlight, and forests. Non-renewable' natural resources are important things in the environment that do not come back naturally, for example coal and natural gas.
concept_name: people
headings: Environment Natural environment
categories: Biology Ecology Earth sciences