More solar energy reaches the earth in a single day than humans use worldwide in an entire year.  See, e.g., http://www.sandia.gov/~jytsao/Solar%20FAQs.pdf at page 10. ("This theoretical potential represents more energy striking the earth’s surface in one and a half hours (480 EJ) than worldwide energy consumption in the year 2001 from all sources combined (430 EJ)." ). … [Read more...]