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.
Naturalism is the view that every law and every force operating in the universe is natural rather than moral, spiritual, or supernatural. Naturalism is inherently anti-theistic, rejecting the very concept of a personal God. Many assume naturalism therefore has nothing to do with religion.