2] Increase in moisture losses from ground and vegetation-cover areas associated with global warming.
3] Rapid dry-up of the surface of earth.
4] Increase in demand for daily-life and industrial water (especially in developing countries).
On the other hand, an increase in the CO2 density will improve water use efficiency (W/T, where W = Dry Matter Production and T = Amount of Transpiration), whereby the plant community's demand for water in the farmland is expected to be smaller somewhat than the values used above.
4. Afterwords
The global environment plays the following four roles (functions) against all lives including human beings (Uchijima, 1990).
1] To allow creatures to perform activities for living and raise their next generations.
2] To produce and store energies and substances necessary for living.
3] To transport energies, substances, and waste products.
4] To decompose and process corpses and waste products to prepare for recycling.
These four major functions are given to the global environment by continuously incidenting solar energy from the sun, the huge amount of water, and behaviour of lives (especially plants) with their history of some four billion years of evolution.
The Earth is, however, exposed in the danger of extraordinary growth and activities of one species - the human race. This danger is brought by "Global Resource Utilization Technology" which has been developed by outstanding performances of the cerebra. This is the system and performance of civilization to regard everything of the Earth (space, phenomena, substances, and lives) solely as resources to enrich our own lives and deplete them. As mentioned earlier, the planet of water - the Earth is the only and safe habitat for all species with their history of some four billion years of evolution, and is the planet that provides various resources for them.
