Isn't some of it scraped from the inside of factory smokestacks?
Discussion
from what im learning, a small amount is a byproduct of aluminum smelting. but the majority is an acid byproduct of chemical fertilizer production
Isn't some of it scraped from the inside of factory smokestacks?
from what im learning, a small amount is a byproduct of aluminum smelting. but the majority is an acid byproduct of chemical fertilizer production