“Harvesting the Biosphere is still the most fundamental economic activity of modern civilization. Crops for food, crops for animals, wood, raw materials, wool, cotton… without these things there is no civilization.”
How much life is there in the biosphere? By “biosphere,” he means everywhere on earth where there are living things: in the air, on the ground, and in the oceans. …Ultimately he concludes that the dry mass of all living things on Earth is about 1.6 trillion metric tons.
To read a book review written by Bill Gates and watch a little video from the author, visit: http://www.thegatesnotes.com/Books/Energy/Harvesting-The-Biosphere