B. decreased use of natural resources.
Explanation:
The World Trade Organization (WTO) states in its World Trade Report - Natural Resources that natural resources are "stocks of materials in the natural environment that are scarce and economically useful." That is, if they are overused (and are being) they will end and we will have (already have) a big problem.
These natural resources not only include oil, natural gas or coal. Food is also part of it as is drinking water, the most necessary asset for the continuity of life of most animals, mainly men. The responsible for all this is our species. The situation is so serious that scientists led by Anthony Barnorsky of the University of Berkeley, California, published a study showing that we are striding toward sixth mass extinction, a situation in which 75% of species of the planet will simply cease to exist.
In the last 540 million years, this phenomenon has occurred only five times. The last mass extinction, 65 million years ago, decimated, among others, the dinosaurs, and was the result of the fall of an asteroid on Earth. According to the researchers, the extermination can occur in a period ranging from 22 thousand to 600 thousand years, a very small time from the geological point of view. What is curious, not to say tragic, is that man would probably survive hecatomb, according to the researchers, even though he is the cause of misfortune due to overuse of the planet's natural resources.