Not Economically Viable was created in 2004.
It was not thought to be economically viable.
After conducting market research, we identified several viable solutions to increase our company's profits.
It was an economically viable option to use slaves.
A mineral that is useful and economically viable to extract and purify is an ore.
pipelines
Whilst a high pressure would favour the products in equilibrium it is not economically viable to produce and maintain such a high pressure. By use of a Vanadium (V) Oxide cataylst this process is able to be carried out at normal pressure and be economically viable.
Not really at this time. Solar energy would be viable once fossil fuel energy source become possibly double (the cost) of what they are today. This sector is taking a gamble on new environmentally friendly philosophy that the world has recently embraced. Thus, would solar energy ever be economically viable? no doubts it will be just not at this time.
Sometimes extracting the metal would cost more than would be economically beneficial, either because of where it is located, the process that would need to be used to extract it, or other reasons.
Corn needs large plots of land to be economically viable as a crop, so it is not grown commercially in any cities.
Fritz Haber of Germany attempted this in the 1920's. Kaiser's Germany thought this would be an easy out solution to pay war debts. But the concentration was too small to be viable. Then came the 1930's.
Hydroelectricity does not contribute to global warming.