The sun seems like an unlimited source of energy, and it almost is. By the time the sun’s rays hit the earth, a little more than half (about 53%) of the sunlight is reflected away due to clouds, dust, and the atmosphere. If we calculate the average amount of energy that hits the earth’s surface on a given day it is about 164 watts per square meter (in a 24 hour span). This means the entire earth receives 84 terrawatts per day. To put this in perspective, one kilowatt is equivalent to leaving 10 100 watt lights on for an hour. Also, the entire earth consumes around 12 terrawatts of energy per day.
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