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• biotechnology1
• clean air act1
• clean energy1
• climate change1
• conservation1
• deforestation1
• emissions1
• greenhouse effect1
• greenhouse gases1
• habitats1
• ice caps1
• international laws1
• invasive species1
• journalism1
• natural disasters1
• natural gas1
• oil1
• preservation1
• renewable energy1
• sea-level1