The authoritative United Nations committee said the last decade was hotter than any period in 125,000 years.
It’s been called the most significant climate-change update in nearly a decade, the U.N.’s authoritative Intergovernmental Panel on Climate Change report released Monday. It set more precise and warmer forecasts for the 21st century than the last time it was issued in 2013.
Human cause Human-generated greenhouse gases have already elevated the global average temperature by about 1.1° Celsius above the late 19th century average. In fact, the last decade ran hotter than any period in 125,000 years, the report said. Read: From gas savings to tax credits: 7 things to know about Biden’s new electric vehicle and mileage rules
The Earth’s response to a theoretical doubling of preindustrial CO₂ levels is now thought to be between 2.5°C to 4°C. It may not seem like much change, but that’s a much tighter range than 1.5°C to 4.5°C in previous IPCC reports and one that could better shape public and private sector responses to global warming.
One such researcher, the World Weather Attribution, felt confident enough to release a “rapid response” summary this summer saying the North American record heat wave would have been “virtually impossible” without human-led climate change. As evidence that the science does need room to evolve, he said it’s not clear that hurricane changes are due just to the effects of greenhouse gases, in part because reductions in particulate pollution have also had important effects.
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