The united states uses which source of energy to produce almost 40 percent of its electricity

Coal is responsible for 40% of the energy produced in the USA.

Explanation:

Coal is responsible for about 40% of all electricity produced in the USA, even though there are several campaigns to decrease the use of fossil fuels such as coal, for energy production, due to the growing climate changes and degradation to nature that provoke. However, coal presents itself as a cheap and easily available source of energy, which explains its widespread use in the country.

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answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.