D Mercury Pollution in the World
3. Value of the natural environment

In human history, we have constantly destroyed the natural environment in order to exploit natural resources.
Even today, many people believe that we should develop wild land to make it more "useful" for people. Is the natural environment less "useful" than land developed by people?

Forests produce oxygen; oceans control climate; lagoons purify water. According to a scientist who has estimated the costs of these "services", if people construct facilities to offer these "services" instead of nature, the annual operating costs of these facilities will exceed 33 trillion dollars.
In other words, the natural environment continuously offers services of this value free.

If we continue to destroy the natural environment, we will have to pay for these free services.