Which of the following is NOT a major Earth component?

His point was that exponential population growth is commonly not understood. World population, for
example, quadrupled in the 20th century from 1.6 billion, in 1900, to over 6 billion, in 2000, and it
took only 12 years for the last billion people to be added to our population. Doubling times will
continue to get shorter unless population growth rates decrease. This trend cannot continue indefinitely
in a world of finite resources and living space.

Haber discovered how to fix nitrogen from the atmosphere into compounds that could be used to make
synthetic fertilizer. This greatly boosted the Earth's carrying capacity, but it also caused very serious
global water pollution problems

143,998 square kilometers contains 153,998,000,000 square meters. In order to get from a population
of 161,084,000 to a population of 143,998,000,000 it would take a little over 440 years (slightly more
than 10 doublings); the carrying capacity will be reached much sooner.