| renewable energies | land degradation | deforestation | hazardous waste | climate change |
| restricting laws | erosion | over cultivation | water contamination | global warming |
| wildlife conservation | drought | poaching and over fishing | smog | fossil fuel |
| less productive | biodiversity | pollution/pollute/pollutant | emissions | |
| sustainable | the balance of ecosystem | ozone layer depletion | toxic fumes |
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نویسنده: ابوالفضل شریفی