Â鶹Éç

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Does the world's most widely-used weedkiller pose a threat to human health? Concern is growing that it might. In 2014, experts at the International Agency for Research on Cancer - part of the World Health Organisation - declared that a herbicide called glyphosate "probably" causes cancer. The Â鶹Éç's Alex Ritson talks to campaigner Katherine Hamnett.