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Creating air bases and then later vacating them after intensive use has caused harm, as has the failure in airpower’s first seventy years to create aircraft than can be repurposed or deconstructed with minimal environmental harm. The book argues that, during both peace and war, air forces have far greater carbon footprints than armies and navies.
Airpower can be considered a function of air supremacy and numbers. Roughly speaking, a combatant side that has 100% or near 100% control of the skies has air supremacy; an advantage of some 70–90% would indicate air superiority. A 50/50 split is air parity; lower than this, one side may be said to be air denied or air incapable.
Air pollution is an important risk factor for various diseases, such as COPD (a common lung disease), stroke, heart disease, lung cancer and pneumonia. Indoor air pollution is also associated with cataract. [117] Air pollution has further been linked to brain disorders, such as dementia, depression, anxiety and psychosis. [118]
Low-power or insulated versions of these devices give off less heat for the air conditioning to remove. The air conditioning system can also improve efficiency by using a heat sink that is cooler than the standard air heat exchanger, such as geothermal or water. In cold climates, heating air and water is a major demand for household energy use.
Sunlight also drives most weather phenomena, save a few exceptions, like those generated by volcanic events for example. An example of a solar-mediated weather event is a hurricane, which occurs when large unstable areas of warm ocean, heated over months, suddenly give up some of their thermal energy to power a few days of violent air movement.
The variable source may be quite predictable, for example, tidal power, but cannot be dispatched to meet the demand of a power system. Environmental impact of wind power – relatively minor compared to the environmental impact of traditional energy sources. Wind power consumes no fuel, and emits no air pollution, unlike fossil fuel power sources.
Flow rate of air This is in part related to the concentration points above. If "fresh" air (i.e., air which is neither already saturated with the substance nor with other substances) is moving over the substance all the time, then the concentration of the substance in the air is less likely to go up with time, thus encouraging faster evaporation.
Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not. It is defined descriptively by the capacity for homeostasis, organisation, metabolism, growth, adaptation, response to stimuli, and reproduction.