7.7 Can power from currents be harnesses as a source of energy?

movement of ocean currents often been considered to be capable of providing a source of renewable, clean energy similar to that of wind farms but underwater

currents move slower than wind but carry much more energy bc water has 800x density of air

• result: currents have potential to generate even more power than windfarms due

• in theory, oceans could power entire globe w/out adding any pollution to atmosphere and would be more dependable than wind or solar

cons: very expensive, difficult to maintain, potentially hazardous to ship traffic, can disturb/injure/kill marine life