Energy flows	Power	Unit
Global intercept of solar radiation	170 PW	peta, +15
Richter magnitude 8 earthquake	1.6 PW	peta, +15
Large volcanic eruption	100 TW	tera, +12
Global fossil fuel combustion	10 TW	tera, +12
Average US tornado	1.7 GW	giga, +9
Four engines of Boeing 747	60 MW	mega, +6
Watt’s largest steam engine	100 kW	kilo, +3
A typical microwave oven	1 kW	kilo, +3
Basal metabolism of a 70-kg man	80 W	Watt = J/s