Answer to Question 1
This probably occurred because of the cost of transportation, which was greater
for steel cans, and because steel cans changed the taste of beer (and presumably other
drinks, though it was less obvious). The beer bottlers adopted aluminum cans and because
of economies of scale, other bottlers did as well.
Answer to Question 2
The residue, if left in place, can contribute to soil fertility. Retention of organic
matter enhances subsequent productivity. Removal of all ground cover, characteristic of
clearcutting, can have adverse effects on the soil and hinder reestablishment of the local
ecosystem.
Free Energy
Ancient drawing of energy channels and acupoints.
Food choices vs. energy choices
The oceans have absorbed 90% of excess energy
France has produced most of its energy from nuclear power since the oil crisis of the 1970s
Electromagnetic Spectrum of Radiant Energy