At the end of July, Hillary Clinton said that as president she would aim to get 33 percent of the U.S.’s electricity from renewable sources by 2027 — up from about 13 percent today (half of it from hydro). A week later, the Barack Obama administration said its new power-plant rules would require renewables to make up 28 percent of power capacity by 2030.

Promising more renewable power, without considering the costs, only panders to those who already support that goal; it doesn’t advance the debate over how to achieve it, or enhance the consensus needed to carry it out. 

—  Christopher Flavelle, Talk Is Cheap. Renewable Energy Isn’t, BloombergView