put an unprecedented strain on, confront environmental problems, release greenhouse gases, release exhaust fumes, have a devastating impact on, take a toll on, cause soil erosion, chemical pesticides and fertiliser, improve immune system, under threat from, in danger of, put something at risk, waste disposal bins, reduce carbon emissions, cause irreparable damage to, lead to species losses, the clearing of trees, an urgent need, focus on sustainable development

Unit 15 - Collocation

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