It's incredible the impact humans have had on the natural resources of the earth in the last 10,000 years. From agriculture, deforestation, human exploitation, industrial pollutants, over-population, extinction of other species, changing the composition of our atmosphere, etc. The time it has taken to create these serious problems isn't even a blink of the eye in the age of the earth or the universe. Humans are the most self-destructive creatures that have ever lived.