Ukázka z referátu Voda
...
Můžeme sice ekologicky vyčistit náš domácí odpad, přesvědčit rolníky,
aby nepoužívali tolik umělých hnojiv, ale odpadní vody z továren jsou
jiný případ. Průmysl používá vodní toky jako levný prostředek ke
zbavení se odpadu. V každé zemi existují předpisy, které mají zabránit
průmyslovému znečišťování vod, ale tyto předpisy se často porušují. Výtoky
z továren často znemožňují zpracování odpadu v kanalizaci, které
spoléhá na činnost bakterií. Některé typy je totiž zabíjejí.
Lidé v průmyslových zemíc jsou značně nepokojeni odpadními vodami
z továren. Mnohé z těchto látek končí v síti s pitnou
vodou. Hladina chlórových rozpouštědlech přesahuje doporučenou normu v 10
% britských studní. Ve zbytku Evropy a v Severní Americe. Ve vodě se
hromadí těžké kovy, oxidy kovů i vedlejší produkty farmaceutického průmyslu.
Starší z nás si zvykli pohlížet na nekonečné moře jako na symbol
čistoty. Oceány jsou tak obrovské, že jsme si ani nemysleli, že by člověk
mohl znečistit. V dnešní době ovšem musíme přehodnotit, protože i
uprostřed širého oceánu můžeme narazit na plovoucí odpad.
Nemyslíte, že je nutné se nad touto skutečností zamyslet?
Celý referát Voda
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