Poisonous algae in Lake Erie seem to result from [ a change in the form of phosphorus used in fertilizer ]( http://www.theguardian.com/world/2014/aug/03/toledo-water-pollution-farming-practices-lake-erie-phosphorus ) .
Ссылка: https://stallman.org/archives/2014-may-aug.html#17_August_2014_%28Poisonous_algae_in_Lake_Erie%29