Environmental

Flight

Airbus A320

• ~8000 in service...
• 1 takes off every 2½ seconds
• [citation needed]: some time 2010-2020?

Sun

• Sun energy -> Earth: ~180 W/m²
• Solar energy: ~7000 x Earth's (human) consumption
• With current solar cells, a square 291 miles a side (0.15% of the Earth's area (land or total?)) in the tropics could supply our current needs.
• [citation needed]: some time 2010-2020?