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and wasted natural resources.Sustainable development focuses on the environment and natural resourcesEverything we do requires the use of Earth’s natural resourcesT5. of energy.Polluting the environment and causing global warming and acid rain.Renewable energyusageexamplesSolar energyProviding heat ,light, hot water and electricity8. _________renewable。help the environmentWind energyProducing electricity\Producing electricityIn Costa RicaSuggested answers:1. sustainable development 2. The importance 3. preserving 4. fossil fuels 5. nonrenewable 6. forms 7. examples 8. in Nigeria9. Hydroelectricity 10. run out3. Read the article again and find how the passage is organized.Part 1 (para. 1 para. 3) importance of sustainable developmentPart 2 (para. 4 para. 10) sources of energy including fossil fuels and renewable energyStep 3 Language points1. repay (P9) vt. 償還;報(bào)答,回報(bào)repay sb. sth. / sth. to sb. 歸還,償還 repay sb. for sth. 因某事回報(bào)某人① He hasn’t repa