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40% of US electricity is now emissions-free
(arstechnica.com)
This is a most excellent place for technology news and articles.
'Natural' gas is just gas. It's not a clean emission free fuel. It's better than coal but by no means a clean fuel.
It has about half the carbon emissions of coal. Much much better, but no where close to clean.
Better than coal is its main selling point.
And converting coal power plants to natural gas can be a partial interim solution on the way towards larger amounts of non-polluting generation.