Water recycling programs used treated wastewater fhe stored energy in organic matter is released during burning. Which energy sources can be used to produce electricity in this way?
a) Wind and geothermal heat
b) Sunlight and nuclear power
c) Fossil fuel and biofuel
d) Sunlight and water
Or what purpose?
a) Drinking water
b) Bacteria filtration
c) Field irrigation
d) Chemical dilution