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Uno studio del Gruppo di interesse per un ambiente pulito ha promosso a pieni voti il ricorso a "padrini di spazi pubblici", che puliscono e mantengono ordinati determinati luoghi. Un’azione efficace per combattere il sempre più dilagante malcostume dell’abbandono di rifiuti.
La ricerca, realizzata in collaborazione con il politecnico di Zurigo e su incarico dell'Ufficio federale dell'ambiente, ha mostrato che la presenza di queste figure fa aumentare le inibizioni di chi abbandona immondizia nella natura.
Due casi: dal 2006 a Illnau-Effretikon (ZH) diversi privati, associazioni, scuole, imprese e commercianti sono attivi come “sorveglianti” e si occupano di determinate zone. Il progetto gode di grande successo. A Basilea Città invece, l'Ufficio dell'ambiente propone alle classi scolastiche di eseguire interventi in cambio di controprestazioni: la pulizia settimanale del piazzale dà ad esempio diritto a un nuovo canestro da installare in cortile.
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