Is the natural gas sold to other countries by Russia produced in a more environmentally detrimental way than the natural gas sold by the US? How? Why?
Are there long-distance water pipelines emanating from the North American Great Lakes region? Why or why not?
What is the % of energy produced per year which is renewable energy (including hydropower, biomass, ...) in the U.S. and in the whole world?
Why do the best energy star freezers have higher capacity and lower rated power consumption than the best refrigerators?
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