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• climate change✖[remove]2
• pollution2
• air pollution1
• astrophysics1
• atmosphere1
• climatology1
• conservation1
• endangered species1
• environment1
• environmental sciences1
• geoastrophysical1
• glaciology1
• global warming1
• hydrology1
• land use1
• meteorology1
• physical oceanography1
• plant science1
• radiation1
• soil1