Or we can at least get them energy at the same price that they would have paid for energy from hydrocarbon, non-renewable, polluting sources.
The high-pressure motive steam can be produced from concentrating solar thermal system, which is a renewable and non-polluting source of energy.
There are always other governments for whom tax services are a non-polluting source of national income.
The most important polluting source of nutrient pollution is nitrate.
How can the country cut its dependence on this polluting source of energy?
The anthropogenic discharges constitute a constant polluting source, thereby reducing the water quality.
Direct geothermal heating systems contain pumps and compressors, which may consume energy from a polluting source.
They ought also to develop less polluting sources of energy.
By area, total population exposure in Dallas County in 2000 was more attributable to vehicle polluting sources than industrial polluting sources at all levels of exposure.
Photovoltaic cells need to have a long operative lifetime, in order to be competitive against the so-called polluting sources.
Phosphorus from polluting sources such as agriculture and municipal wastewater cause the blue-green algae to grow in the summer.
