Appearing on Saturday's CNN Newsroom and again on New Day Sunday to discuss the international summit on global warming, CNN correspondent Nick Paton Walsh repeatedly fearmongered about the possibility of "catastrophe" in a decade if "drastic" changes are not taken to combat global warming.

On Saturday at 3:41 p.m. Eastern, host Ana Cabrera teased that scientists are proclaiming that it is "now or never" to act on the "climate change" issue. A few minutes later, introducing the segment, she hyped that it is "make or break time" for the summit in Poland in which many nations are trying to make agreements on regulations as a followup to the Paris Accord.

After bringing aboard Walsh, Cabrera recalled that "part of the problem is that the Trump administration has caused a little bit of a delay be rejecting some of the science."

Walsh, who reported from Russia as a correspondent for the socialist newspaper The Guardian, soon complained that the U.S. "did not endorse something which is simply a scientific fact, that the world will get drastically warmer in just under 12 years."

He then bemoaned:

So a bit of sadness for those who expected to see greater global unity here, a greater sense of consensus, because really it's that kind of message that you and I need at home to make those drastic changes to our daily lives that will stop catastrophe, frankly, in just over a decade.

Walsh added: "The California wildfires, things we've seen in Europe, Puerto Rico's massive storms -- all of them can be linked to changes in our climate, linked to man's actions, linked to climate change."

But dissenters have pointed out that hurricane seasons in past decades have been worse. There was also massive drought in the 1930s.

About an hour later, Walsh repeated some of the fearmongering:

We have 12 years in which to keep global warming to just 1.5 degrees Celsius or see catastrophic change. You're seeing bits of it in the storms that are hitting the East Coast of the U.S. A lot of that extreme weather is linked to manmade change in the environment, and also forest fires ravaging parts of California. It's happening.

Moments later, he added that "it's simply a fact" that greenhouses gases produced by fossil fuels are "going to do terrific damage to the planet in the decade ahead."

As he appeared at 7:34 a.m. on Sunday morning. Walsh fretted that "the world is not in a good place now," and asserted that "massive change has to be undertaken in just 12 years to stop global warming at 1.5 degrees Celsius and really stop the world that we know and live in now from being unrecognizeable in just over a decade."

He soon added: "There's just over a decade for all the world's economies to radically change how they fuel themselves before we possibly see this planet change to an unrecognizeable future."