Throughout history, the ocean has been a vital source of sustenance, transport, commerce, growth, and inspiration. This second type of rainwater is termed “green water”. This is due to the prevalence of water on the planet's surface. In the map we see levels of water access across the world, measured as the percentage of the total population with access to improved water sources. Water removed for use and not returned to its source. The majority of rainfall comes down on the Earth’s surface and either evaporates directly as “non-beneficial evaporation” or, after being used by plants, as “productive transpiration”. Another 30 percent of the planet's fresh water is located in the ground, within a half-mile of the Earth's surface. Water is a critical input for agricultural production and plays an important role in food security. The Earth is often compared to a majestic blue marble, especially by those privileged few who have gazed upon it from orbit. Water covers 70% of our planet, and it is easy to think that it will always be plentiful. Some 72 percent of Earth is covered in water, but 97 percent of that is salty ocean water and not suitable for drinking. Only 3% of the world’s water is fresh water, and two-thirds of that is tucked away in frozen glaciers or otherwise unavailable for our use. The other 99.7 percent is in the oceans, soils, icecaps, and floating in the atmosphere. The earth has an abundance of water, but unfortunately, only a small percentage (about 0.3 percent), is even usable by humans. More than 68 percent of the planet's fresh water is largely inaccessible, located in glaciers, ice caps and permanent snow. However, freshwater—the stuff we drink, bathe in, irrigate our farm fields with—is incredibly rare. In industrialized nations, however, industries consume more … Still, much of the 0.3 percent that is useable is unattainable. Irrigated agriculture represents 20 percent of the total cultivated land and contributes 40 percent of the total food produced worldwide. Most of the water used by humans comes from rivers. The ocean is the lifeblood of Earth, covering more than 70 percent of the planet's surface, driving weather, regulating temperature, and ultimately supporting all living organisms. Worldwide, agriculture accounts for 70% of all water consumption, compared to 20% for industry and 10% for domestic use. Sources and methods: The data on water consumption in the world is provided by the United Nations (UN, UNESCO, and FAO, see list of publications below).

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