Some scientists question the new study by James Hansen and others, which asserts Earth is warming faster than previously estimated.
National Disaster Response Force personnel distribute relief material to flood affected people stuck in a low-lying area around the river Yamuna in New Delhi, July 14, 2023. Thirty-five years ago, NASA climate scientist James Hansen stood in front of Congress with a bold declaration: humans are causing an increase in greenhouse gas emissions, and it’s changing our climate. Some scoffed, but, in coming decades, people saw how dire this warning was.
“The 1.5 degree limit is deader than a doornail,” Hansen, now a director at the Earth Institute at Columbia University, said in a press call with reporters on Thursday. “In the next several months, we’re going to go well above 1.5C on a 12-month average ….For the rest of this decade, the average is going to be at least 1.5.”Since the preindustrial era, Earth has warmed around 1.2 degrees Celsius on average. But at times, temperatures have spiked beyond that.
Under the current trajectory of greenhouse gas emissions, they predicted the 1.5 degrees benchmark will be passed in the 2020s, and 2 degrees of warming will be passed before 2050 — a markedly faster rate compared to the prognosis from other scientists. In its most recent landmark climate report, the United Nations stated global temperatures would reach 1.5 degrees in the
Not everyone agrees with the new study. Michael Mann, a professor of earth science at the University of Pennsylvania, posted a lengthy“The standard is high when you’re challenging scientific understanding,” Mann wrote. “And I don’t think they’ve met that standard, by a longshot.”Mann argued the ocean’s heat content is growing steadily, but — in contrast to Hansen and his co-authors — is not accelerating.
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