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San Diegans received cell phone notifications warning of poor air quality in San Diego
San Diego-area at night from space. Image: NASA
Astronauts in the International Space Station snap photographs of Earth from a height of 220 miles above the ground. At night, distinct features appear.
In this photograph, west is on top, north is on the right. San Diego Bay is in the center of the photograph.
What can we learn about the human impact on Earth from so far away?
Resources:
NASA: China's Wall Less Great from Space