Human activity has greatly altered the terrestrial and atmospheric nitrogen cycle, doubling the annual amount of nitrogen available in forms that are useful to living organisms.
The amount of available nitrogen has been increased.
Human activity has been decreasing the amount of nitrogen on Earth.
men playing hockey
A woman takes a bath.
A ritual dance is being performed by two children.
Three teenagers are carry wood down a street.
You think so but I just don't think that's it.
The people are playing near the beach