Abstract
The current concern with global environmental issues — climate change, biodiversity loss, ozone layer depletion, etc. — reflects the evolution in thinking about environmentalism which has taken place over the last twenty years or so. During the 1970s concern was overtly focused on source limits, i.e. population growth and natural resources and food supply, with relatively less emphasis on sink limits, i.e. pollution and the assimilative capacity of the biosphere. By the time the United Nations Conference on Environment and Development (UNCED) had taken place in the summer of 1992, the primary focus for concern had shifted towards sink limits. Hence UNCED concentrated on two main issues, for which international agreements were signed, climate change and biodiversity.
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