Climate Report Warns of Catastrophic Consequences as Warming Surpasses 1.1 Degrees

A historic report from the Intergovernmental Panel on Climate Change (IPCC) warns that the world is careening toward a catastrophic 1.5-degree Celsius threshold, with stark consequences for life as we know it. The report, which is a culmination of nearly a decade of climate research by scientists worldwide, concludes that humans have caused the climate crisis and that "widespread and rapid changes" have already occurred, some irreversibly. The scientists warn that the world has only a narrow window to make deep cuts to greenhouse gas emissions and remove carbon dioxide from the atmosphere to halt the precipitous trend. If this is not achieved, the consequences will be dire, with extreme weather, including deadly floods, droughts, and wildfires, becoming more frequent and severe.

Key Takeaways:

• The IPCC report concludes that the world has warmed 1.1 degrees Celsius higher than pre-industrial levels and is now careening toward the 1.5-degree threshold.
• The report is "unequivocal" that humans have caused the climate crisis and confirms that widespread and rapid changes have already occurred, some irreversibly.
• The IPCC report warns that the most severe effects of climate change are already happening, including more frequent and intense wildfires, droughts, and floods.
• The report concludes that the likelihood of crossing tipping points, such as those in California, will increase with every fraction of a degree of warming.
• Scientists warn that beyond 1.5 degrees, the climate system could become unrecognizable, with the risk of "low probability, high impact" events increasing.
• The report emphasizes that it's still possible to prevent the most dire impacts, but this requires unprecedented transformational change, including rapid and immediate reduction of greenhouse gas emissions to net zero by 2050.
• The report concludes that widening the gap between current climate commitments and what's necessary to limit warming by 2030 will only worsen the consequences.

Statistics:

• The world has warmed 1.1 degrees Celsius higher than pre-industrial levels.
• The global temperature will still peak above the 1.5-degree threshold even under the IPCC's most optimistic scenario.
• Since 2018, greenhouse gas emissions have continued to increase, pushing global temperatures higher.
• Heavy rainfall that used to occur once every 10 years now occurs 30% more frequently.
• Globally, droughts that may have occurred once every 10 years or so now happen 70% more frequently.
• Sea level itself will continue to rise well into the 22nd century, simply because of the amount of heat the oceans have already trapped.
• Human carbon emissions are on course to surge by 1.5 billion tonnes in 2021, reversing most of last year's decline caused by the Covid-19 pandemic.

Sources:

• Intergovernmental Panel on Climate Change (IPCC) report
• CNN interview with Michael E. Mann, a lead author of the IPCC's 2001 report
• CNN interview with Ko Barrett, the former vice chair of the IPCC
• CNN interview with Dave Reay, the director of the Edinburgh Climate Change Institute
• CNN interview with Michael Byrne, a climate researcher at the University of Oxford
• CNN interview with Charles Koven, a lead author of the report's chapter on global carbon cycles
• CNN interview with Andrew Watson, a scientist at the University of Exeter