Faced with the Intergovernmental Panel on Climate Change’s latest report, some environmental leaders are all too ready to toss a lifeline to aging, uneconomic nuclear power plants. The Union of Concerned Scientists (UCS), long venerated as America’s most rigorous nuclear watchdog group, joined this chorus in early November.

The UCS report, "The Nuclear Dilemma," proposes that we single out “safe” but financially ailing nuclear plants and subsidize their operations, so that they might remain open — thus avoiding additional carbon emissions from coal or natural gas plants that might replace them. America gets about 20 percent of its electricity from nuclear power, but only 17 of the 99 reactors that generate this power are unprofitable, according to UCS. Those reactors account for just 3 percent of overall U.S. power generation, though UCS says the share of unprofitable nuclear plants could grow in future years if the price of natural gas drops or the costs of maintaining older nuclear facilities rise.

What do we gain by breathing some extra life into these plants? Proponents say “zero-carbon emissions.” That's if we choose to ignore the emissions associated with mining and processing uranium, building nuclear power stations, managing nuclear waste, and — on those rare but horrific occasions — dealing with the consequences of a major nuclear disaster.

Bailing out old, financially shaky nuclear plants is a short-sighted response to a huge challenge that requires much bigger, much more transformative thinking. Instead, we ought to invest big in our leading zero-carbon alternatives — solar and wind — which offer far cheaper electricity and, unlike nuclear, have life-cycle costs that have steadily dropped over the past several years.

Setting aside the questionable economics of boosting the bottom lines of unprofitable power plants, how would we determine if a nuclear plant is “safe”?

The UCS recommends that we rely upon the Nuclear Regulatory Commission’s five-tier performance matrix, and offer financial support only to plants that have earned the NRC’s highest rating. In 2002, the Davis Besse Nuclear Power Station in Ottawa County, Ohio, enjoyed that rating, but in March of that year, its reactor vessel — which contains the nuclear reactor coolant and shrouded reactor core — was found to be a fraction of an inch away from a potentially catastrophic rupture. Years of undetected corrosion had worn a football-sized hole in the vessel wall.

If the vessel had ruptured, the plant’s backup water pump (which was known to be impaired) would not have been able to re-flood the reactor vessel, an essential step in stabilizing the reactor core. In a recent interview, UCS scientist Dave Lochbaum, a seasoned reactor engineer, told me he remembers telling residents near Davis Besse: “You can stop buying lottery tickets. Your luck has been used up.”

Hundreds of thousands of people in Central Europe and Japan didn’t fare so well in the nuclear safety lottery.

This 2017 photo shows the deserted town of Pripyat, some 3 kilometers from the Chernobyl nuclear power plant in Ukraine. Once home to some 50,000 people whose lives were connected to the plant, Pripyat was evacuated one day after a reactor at the plant exploded on April 26, 1986. (Efrem Lukatsky/AP)

Following the Chernobyl disaster in 1986, some 350,000 people were evacuated from parts of Ukraine and Belarus, and to this day 1,000 square miles of territory remain off-bounds to human habitation. In Japan, some 100,000 people had still not returned home five years after the March 2011 meltdown at the Fukushima Daiichi plant. Utterly different circumstances precipitated these two nuclear disasters, as well as the earlier meltdown at Three Mile Island, but all three proved the statistician’s axiom that rare events do happen.

And then there’s the question of security at nuclear plants.

Shortly after the 9/11 attacks on the World Trade Center and the Pentagon, word got out that unnamed nuclear plants were on al-Qaida’s list of potential terror targets. This was particularly alarming to people living near the Pilgrim power station in Plymouth, Massachusetts, situated on the flight path of the hijacked planes departing from Logan Airport.