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Across 3. Refers to a process that can be continued without economic, social or environmental problems. 7. Something which can be used to achieve a goal. 8. Nitric acid and sulphuric acid which falls as rain after mixing with the nitrogen and sulphur emitted by vehicle exhausts. 9. A form of energy that converts solar energy to electrical energy. 10. Something which can be used only once to achieve a goal.

Down 1. Land scarring that results from salt rising to the surface when trees are removed. 2. The idea that all waste, whether created during the design process or when the product is no longer useable in its current state, should be able to be reused. 4. Something which can be used forever to achieve a goal. 5. Growing plants to absorb carbon and reduce the impact of emissions. 6. A sustainable system of agriculture which returns as much energy and nutrient material to the soil as it takes out. 11. A fuel that is made from renewable organic material rather than fossil fuel.