What the city is missing: Thierry Cohen photographs cityscapes and then photographs deserts at night, combing the two to show us what our cities would look like with the lights off. The stars are not enhanced, they are actual photos from relative latitudes that would expose the same starry sky view if it weren’t for light pollution. Click on each photo to see which city it is.
Light pollution and pollution in general
Carl Sagan in Cosmos (episode 13, Who Speaks for Earth?)
All the Water on Planet Earth
Illustration Credit & Copyright: Jack Cook, Woods Hole Oceanographic Institution, Howard Perlman, USGS
Explanation: How much of planet Earth is made of water? Very little, actually. Although oceans of water cover about 70 percent of Earth’s surface, these oceans are shallow compared to the Earth’s radius. The above illustration shows what would happen is all of the water on or near the surface of the Earth were bunched up into a ball. The radius of this ball would be only about 700 kilometers, less than half the radius of the Earth’s Moon