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• air pollution1
• air quality 1
• atmosphere1
• biodiversity1
• biotechnology1
• clean air act1
• clean energy1
• conservation1
• deforestation1
• ecosystems✖[remove]1
• emissions1
• environmental law1
• greenhouse effect1
• greenhouse gases1
• ice caps1
• international laws1
• invasive species1
• journalism1
• natural disasters1
• natural gas1