If aliens were to examine a human, they would think we were just slavish organisms designed to feed microbes and carry them around. Our bodies contain ten times more bacteria than cells , and there are an estimated 3.

Anthropogenic emissions have, until now, been collected, but not harmonised . These consist, for example, of data of nitrogen oxides (NOx) emissions, smog, methane, CO 2 and even pollen and dust produced, among others by heavy industry and power plants.