Sõnastikus on 536 märksõna.
| EN | UN Framework Convention on Climate Change |
| EN | uncertainty |
| EN | underdevelopment |
| EN | United Nations Conference on Environment and Development (UNCED) |
| EN | United Nations Development Programme (UNDP) |
| EN | urban ecology |
| EN | urban mobility |
| EN | urban renewal |
| EN | urban sprawl |
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