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Le attività agricole sono all’origine della forte presenza di pesticidi nei corsi d’acqua. Lo indica uno studio effettuato l’anno scorso in 5 fiumi e torrenti dell’Altopiano dall’Istituto di ricerche EAWAG.
In 4 campioni su 5 sono stati rilevate concentrazioni di sostanze chimiche in gran parte usate per lo sfruttamento dei campi per produrre ortaggi, frutta eccetera. Una trentina di queste sostanze sono in concentrazioni tali da superare i limiti delle ordinanze sulla protezione delle acque. E’ soprattutto la mescolanza fra i diversi prodotti a inquietare e a mettere a rischio la vita degli organismi acquatici.
L’Unione dei contadini ha esaminato con attenzione i risultati dell’indagine e afferma di volere prendere misure non appena i dati saranno più completi.
ats/mas
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