Human Affect on Earth

There are many statistics about the earth, oceans, and weather. Although satellites give us a good picture of land and sea, many parts of both have not been visited or set foot on by humans. Almost all of the earth's subsurface is still unexplored. The following are closest to consensus data that I could find.

About 80% of the earth is covered in water. The other roughly 20% is surface land. NASA's Goddard Institute for Space Studies says urban areas currently take up less than 1 percent of earth's surface.

According to the FAO Global Land Cover SHARE database, produced in 2014, 0.6% of Earth’s land surface is defined as 'Artificial surfaces'. Artificial surfaces include any areas that have an artificial cover as a result of human activities such as construction (cities, towns, transportation), extraction (open mines and quarries) or waste disposal.
Of the 108 billion people that have ever been alive, it is estimated that 6.4 percent of them, roughly seven billion are alive now. So seven billion humans inhabit or use just .6% of 20% of the earth. Since we have yet to discover major parts of land and sea, it is difficult to project future impact, because we still do not know what we do not know.


Incidentally, to date we have explored five to ten percent of the ocean. There are around 8.7 million species on earth of which 80 percent are undiscovered. No one has been able to determine how many ocean species there might be or the percent we may have already discovered. It is estimated that approximately seven percent or more of territorial earth is yet to be discovered. Finally, we have yet been able to fully explore the human body.