An economic surplus is also known as total welfare. An economic surplus is related to money, and it reflects a gain in the expected income from a product. There are two types of economic surplus: consumer surplus and producer surplus.
A bit academic in terms of style, but accessible, nonetheless! Environmentalism refers to a social movement and associated body of thought that expresses concern for the state of the natural environment and seeks to limit the impact of human activities on the environment.
Preservationist is also sometimes used in the natural environmentalist field, but while the natural environment conservationist movements preserve ecosystems and the natural environment, this movement is widely known as conservation or environmentalism.