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Start Over You searched for: Date Created 1999 ✖ Remove constraint Date Created: 1999 Category Economics ✖ Remove constraint Category: Economics Category Economics ✖ Remove constraint Category: Economics Category Science and Technology ✖ Remove constraint Category: Science and Technology Category Science and Technology ✖ Remove constraint Category: Science and Technology Subject Energy Technology ✖ Remove constraint Subject: Energy Technology Subject Sustainable development ✖ Remove constraint Subject: Sustainable development