At an August event In California’s Orange County, Cruz told an interviewer, “If you look at satellite data for the last 18 years, there’s been zero warming. … The satellite says it ain’t happening.”
Florida State University’s James Elsner said ground data show every decade has been warmer than the last since the middle of the 20th century and satellite data-based observations “show continued warming over the past several decades.”
In fact, federal ground-based data, which scientists said is more reliable than satellites, show that 15 of the 17 years after 1997 have been warmer than 1997 and 2015 is on track to top 2014 as the warmest year on record.
Scientists singled out Sanders for overstatement in the first Democratic presidential debate.
“The scientific community is telling us that if we do not address the global crisis of climate change, transform our energy system away from fossil fuel to sustainable energy, the planet that we’re going to be leaving our kids and our grandchildren may well not be habitable,” Sanders said.
Dessler said, “I would not say that the planet will become uninhabitable. Regardless of what we do, some humans will survive.” Harvard’s Jim McCarthy also called the comment an overstatement, as did other scientists when Sanders said it. Recent research on the worst heat projections in the hottest area, the Persian Gulf, finds that toward the end of the century there will be a few days each decade or so when humans cannot survive outside, but can live with air conditioning indoors.
Trump brought out some of the more colorful and terse critiques.
“It could be warming and it’s going to start to cool at some point,” Trump said in a September radio interview. “And you know in the 1920s people talked about global cooling. I don’t know if you know that or not. They thought the Earth was cooling. Now it’s global warming. Actually, we’ve had times where the weather wasn’t working out so they changed it to extreme weather and they have all different names, you know, so that it fits the bill.”
McCarthy, a former president of the American Association for the Advancement of Science, called Trump’s comments “nonsense,” while Emmanuel Vincent, a climate scientist at the University of California, Merced, said, “the candidate does not appear to have any commitment to accuracy.”
The eight scientists are Mann, Dessler, Elsner, McCarthy, Bradtmiller, Vincent, William Easterling at Pennsylvania State University and Matthew Huber at the University of New Hampshire.