Maps that explain the World
The road system of the United States now surpasses four million miles in combined length, plus numerous additional service roads and off-road driving trails. The registered roads and their rights-of-way occupy about 1 percent of the land of the U.S.
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Many of the world’s cities will face sharply different climates by 2050. I tried to visualize how climate change will affect world cities. I chose 6,000 cities and examined the current climate for each using the Global Environmental Stratification based on modeling future climate conditions as predicted by 63 of the emission scenario combinations.
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3 percent (4.5 million km2 / 2.8 million mi2) of the Earth’s land cover is occupied by urban areas. However, even non-urban areas contain roads, railroads and other marks of human presence. Only ten percent of the world is truly a wilderness.
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In 2017 it was estimated that 5.8 percent of the population of the United States was 0–4 years old.
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The visualization shows population density in the United States using the number of people living within a 1 square kilometer grid.
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In 2010 it was estimated that 20.2 percent of the population of the United States were 0–14 years old. In 2017 – 18.3 percent of the population of the U.S. were children and adolescents.
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The ten largest being the U.S., Russia, Japan, Germany, France, UK, Italy, Republic of Korea, Spain and Poland. But during the current decade (2007 – 2017) half of U.S. states lost prime working-age adults from 2007 to 2017.
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In 2019 there were over fifty million people in the United States aged 65 and older. This composes about 15 percent of the total of America’s population.
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The number of older residents across the U.S. continues to increase, but the increase is not evenly distributed across the nation. Some counties tend to be much older than others.
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In these maps, each U.S. county’s population age composition is uniquely color-coded. Colors show direction and magnitude of deviation from
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