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共42条，第1-20条
Science X network 188 EurekAlert! - Earth 134 Department of Conser 101
EurekAlert! 77 Environmental Monito 22 gov.uk-Department fo 20
Environment & Energy 19 Science Daily 15 gov.uk - environment 11
Arctic Council 9 Government of Canada 8 National Science Fou 8
World Resources Inst 6 Scripps Institution 5 British Antarctic Su 4
Institute for Europe 4 us environmental pro 4 Department of the En 3
Federal Environment 3 International Union 3