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… 124 8 Water Resources 160 9 Biodiversity and Soil 190 10 Energy and Climate 212 11 Urbanization 226 12 Drylands 246 … century.49 However, the technology remains unproven.50 Geothermal An important and long-term source in countries … with a large supply, such as Iceland. Lower grade geothermal energy can also be harnessed through heat pump …