calvin4224 t1_j9stugf wrote

Heavy metals in the water may be really bad for animals, e.g. the European oysters which are nearly extinct in the copper-rich (tiny particles) north Sea. We should care about everything we do to our planet. You don't have to care about everything yourself of course. But don't dismiss it as unimportant just because you don't have the energy to care.


calvin4224 t1_iy1cwpz wrote

Concentrated solar is measured in suns. So if I use a mirror or a lens of 2 m^2 area and direct this light on on a 1m^2 solar panel, people talk of in this case two suns reaching the solar panel. The panel still has a similar efficiency, but double the power output due to more light shining on it. I simplified a bit but thats the idea.

Type "concentrated solar" into an image search engine, it's fascinating!