Previously published at WGBHNews.org.

Monday’s broadcast of “The CBS Evening News” began on a portentous note. “Good evening,” said anchor Scott Pelley. “Melting glaciers, rising sea levels, higher temperatures. If you think someone’s trying to tell us something, someone just did.”

Pelley’s introduction was followed by a report on the latest study by the United Nations’ Intergovernmental Panel on Climate Change. According to The Washington Post, the panel found that global warming is now “irreversible,” and that drastic steps must be taken to reduce the use of fossil fuels in order to prevent worst-case scenarios from becoming a reality.

No matter. Before the night was over, Americans had turned their backs on the planet. By handing over the Senate to Mitch McConnell and his merry band of Republicans, voters all but ensured that no progress will be made on climate change during the next two years — and that even some tenuous steps in the right direction may be reversed.

At Vox, Brad Plumer noted that Tuesday’s Alfred E. Neuman moment came about despite more than $80 million in campaign spending by environmentalists and despite natural disasters that may be related to climate change, such as the unusual destructiveness of Hurricane Sandy and the ongoing drought in the West.

“Which means that if anything’s going to change, it may have to happen outside Congress,” Plumer wrote, adding that “the 2014 election made clear that Washington, at least, isn’t going to be much help on climate policy anytime soon.”

Not much help? That would be the optimistic view. Because as Elana Schor pointed out in Politico, Republicans and conservative Democrats may now have a veto-proof majority to move ahead on the Keystone XL pipeline. The project, which would bring vast quantities of dirty oil from Canada into the United States, would amount to “the equivalent of adding six million new cars to the road,” the environmentalist Bill McKibben said in an interview with “Democracy Now” earlier this year.

The problem is that though Americans say they care about climate change, they don’t care about it very much.

In September, the Pew Research Center reported the results of a poll that showed 61 percent of the public believed there is solid evidence that the earth has been warming, and that 48 percent rated climate change as “a major threat” — well behind the Islamic State and nuclear programs in Iran and North Korea.

Moreover, whereas Democrats registered 79 percent on “solid evidence” and 68 percent on “major threat,” Republicans scored just 37 percent and 25 percent. The Republican political leadership, anxious to keep its restive right-wing base happy, has every incentive to keep pursuing its science-bashing obstructionist path.

One possible solution to this mess was proposed in the New York Times a few days ago by David Schanzer and Jay Sullivan of Duke University: get rid of the midterm elections altogether by extending the terms of representatives from two to four years and by changing senatorial terms from six years to four or eight.

As Schanzer and Sullivan noted, presidential election years are marked by high turnout across a broad spectrum of the electorate. By contrast, the midterms attract a smaller, whiter, older, more conservative cohort that is bent on revenge for the setbacks it suffered two years earlier. (According to NBC News, turnout among those 60 and older Tuesday was 37 percent, compared to just 12 percent for those under 30.)

“The realities of the modern election cycle,” they wrote, “are that we spend almost two years selecting a president with a well-developed agenda, but then, less than two years after the inauguration, the midterm election cripples that same president’s ability to advance that agenda.”

There is, of course, virtually no chance of such common-sense reform happening as long as one of our two major parties benefits from it not happening.

The consequences of that inaction can be devastating. According to The Washington Post’s account of this week’s U.N. report, “some impacts of climate change will ‘continue for centuries,’ even if all emissions from fossil-fuel burning were to stop.”

Sadly, we just kicked the can down the road for at least another two years.

Correction: This commentary originally said that CBS News’ report on climate change was aired on Tuesday rather than Monday.