German environmental activist, Andreas Noe, throws cigarette butts as he sits on top of a pile of them, collected in one week, at Comercio square in Lisbon 24/04

Video. Climate activists heap up 650,000 cigarette butts in Portugal

The campaigners collected enough stubs to fill 40 plastic buckets, then emptied them into a mound to raise awareness about the often-overlooked form of pollution.

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