In a strange way, the more energy we produce, the more energy we need. For example, as fossil fuel reserves are depleted, discovering, extracting, processing, and delivering new reserves results in a steadily increasing percentage of energy invested versus energy delivered. Nuclear, and even sustainable, energy sources are experiencing similar supply-side tightening.
The same law of diminishing returns applies to water, especially water used for irrigation and drinking. While it may be everywhere, supply struggles to keep up with demand. What about desalination of ocean water, you might ask? Sure, there’s plentiful supply. But once again, there’s that nagging energy problem. Anywhere from 1 to 3 kilowatt-hours of energy are needed to treat a single cubic meter of salt water.