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Climate Change Denial in the Age of Trump

Climate Change Denial in the Age of Trump

January 29, 2018 SVadmin Comments 0 Comment

Our best hope is perhaps that Trump comes to realize that climate change is a threat not just to human civilization but to the one thing he cares about—Trump.

by Michael Mann
Describing our study, one journalist summarized our key finding as "a snowball’s chance in hell that this was natural."(Photo: Oil Change International/Twitter)

Describing our study, one journalist summarized our key finding as “a snowball’s chance in hell that this was natural.”(Photo: Oil Change International/Twitter)

With a climate change denier in the White House, climate denialism has reached a new low point in America. Indeed, my co-author Tom Toles and I have devoted a whole new chapter to the matter (“Return to the Madhouse: Climate Change Denial in the Age of Trump”) in the new paperback edition of our book The Madhouse Effect (now available for pre-order).

But any chapter on the topic will inevitably become out of date quickly. Indeed, we have our latest episode in the saga. In a new interview with Piers Morgan, Donald Trump continues to deny the basic facts about climate change. As is often the case with Trump, the Costanza principle seems to apply: If Trump makes a claim, then the opposite almost certainly.must be true.

Let’s take a closer look at the veracity (or rather, lack thereof) of The Donald’s latest climate change claims:

1. When asked whether he accepts the scientific consensus behind human-caused climate change, Trump replied “There is a cooling, and there’s a heating”, a version of the standard denialist trope that “climate is always changing“. If you look past the year-to-year fluctuations in temperature due to natural phenomena like El Nino and volcanic eruptions (keeping in mind that Trump can’t even appear to see past day-to-day fluctuations in temperature), it is clear that planet is steadily warming and at a rate that is remarkably consistent with the model simulations as seen in this up-to-date comparison of model-simulated and observed warming produced by NASA Goddard Institute for Space Studies (GISS) Director Gavin Schmidt:

The last four years were the warmest, globally, on record–and that record warmth cannot be explained in terms of natural climate variability. My co-authors and I published an article last year demonstrating that the consecutive 2014, 2015, and 2016 global temperature records were extremely unlikely to have happened in the absence of long-term human-caused planetary warming. Describing our study, one journalist summarized our key finding as “a snowball’s chance in hell that this was natural”. So much for Trump’s first talking point…

2. Trump was also quoted as saying that “The ice caps were going to melt, they were going to be gone by now, but now they’re setting records”.

In referring to the “ice caps” Trump fails to distinguish between sea ice (which floats on water and which does not contribute to sea level rise when it melts) and the continental ice sheets i.e. the Greenland and Antarctic Ice Sheets (which store huge amounts of ice and once they begin to melt are difficult to stop). The distinction is important when it comes to larger climate change impacts, but for our purposes it doesn’t matter, because by either definition of “ice cap”, Trump couldn’t be more wrong with regard to the predictions. Ironically though he does get one thing right: The “ice caps” are setting records–records for rate of ice loss.

The long-term trend in Arctic sea ice is strongly downward and the late summer Arctic sea ice minimum is decreasing faster than the models predicted, as my co-authors and I showed in our 2009 Copenhagen Diagnosis report:

Attempting to give Trump the benefit of the doubt, perhaps he was simply regurgitating the favorite climate change denier talking point that
“southern hemisphere sea ice is on the increase”. There is some truth to that–a small increase was seen for a number of years, though in the southern ocean sea ice extent has far more to do with changing circumpolar wind patterns than temperatures. But that increase is very small, and it is overwhelmed by the dramatic loss in Arctic sea ice. Globally, we are in fact seeing record sea ice….lows. We see that the opposite of what Trump said is in fact true.

OK, but what about the ice sheets? Arguably, from the standpoint of climate change impacts, the melting of the ice sheets is far more significant his is ice that is on land, rather than floating on the ocean, it contributes to sea level rise when it melts.

Here too the best evidence is that the ice sheets that are vulnerable to melting–the Greenland and west Antarctic Ice Sheets–are losing ice, and far sooner than the models predicted. Indeed, the latest research, in particular a 2016 study in Nature co-authored by Rob Deconto of the University of Massachusetts and my Penn State colleague David Pollard, identified processes that had not been include in previous climate modeling assessments that favor accelerated collapse of the west Antarctic ice sheet. That finding has led scientists to double the projections of global sea level rise by the end of the century from roughly a meter i.e. roughly 3 feet (as indicated in the last IPCC report) to about two meters i.e. roughly 6 feet. Once again, the opposite of what Trump claimed is actually true.

Now, we all know that Donald Trump really only appears to care about himself, so perhaps what Trump really means is that climate change simply isn’t a problem…for Donald Trump. Well, even here, he is sadly misguided.

In an article my co-authors and I published in the Proceedings of the National Academy of Sciences (PNAS) last year, we showed that the latest projected increases in sea level rise, combine with more intense hurricanes, combine for greatly increased flood risk where things hit home for Trump–New York City. We even produced a map of maximum projected flood extent that Trump might want to check out—Trump Tower itself is eventually within the danger zone.

By now, most of us have also heard about the special approval that Trump got to build a sea wall to defend his golf course in Ireland from the mounting threat posed by global sea level rise (yes hypocrisy thy name is trump). And Trump’s “winter White House” Mar-a-Lago? Yeah, that’s probably toast too, if we don’t act on climate change.

When it comes to climate change policy in the current administration, our best hope is perhaps that Trump comes to realize that climate change is a threat not just to human civilization but to the one thing he cares about—Trump. But don’t count on it.

This work is licensed under a Creative Commons Attribution-Share Alike 3.0 License

Michael Mann Michael Mannis Distinguished Professor of Meteorology at Penn State University. He was recognized with other Intergovernmental Panel on Climate Change authors for their contribution to the IPCC’s 2007 Nobel Peace Prize. Follow him @MichaelEMann

 

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