Environment & Climate
Global warming will exceed 1.5-degree limit, UN environment report says
A new strategy focuses on limiting peak temperatures before cooling the planet.
The short version
- A United Nations Environment Programme report states Earth will cross the 1.5 degrees Celsius warming limit within the next few years.[Hacker News]
- Global temperatures currently sit at roughly 1.4 degrees Celsius above pre-industrial levels on a 20-year average.[Hacker News]
- Current policies put the world on track for 2.6 degrees Celsius of warming by 2100, while the most optimistic scenario peaks at 1.8 degrees Celsius mid-century.[Hacker News]
- External climate scientists expressed skepticism over the viability of the proposed strategy to reverse the overshoot using carbon removal.[Hacker News]
Key facts
- The United Nations Environment Programme acknowledged in a report that global warming will exceed the 1.5 degrees Celsius threshold in the next few years.[Hacker News]
- Based on a 20-year average, scientists calculate that global temperatures are currently 1.4 degrees Celsius above pre-industrial levels.[Hacker News]
- Existing national policies project warming to reach 2.6 degrees Celsius by 2100, compared to an optimistic scenario peaking at 1.8 degrees Celsius around mid-century.[Hacker News]
- Report co-author Joeri Rogelj estimated that each five-year delay in cutting emissions will add at least 0.1 degrees Celsius to peak temperatures.[Hacker News]
- The report notes that tree planting could reduce global temperatures by at most 0.1 degrees Celsius, requiring newer carbon removal methods.[Hacker News]
What remains uncertain
- Outside climate scientists dispute the likelihood and feasibility of deploying carbon removal technologies at the scale required to reverse the warming overshoot.[Hacker News]
Sources
Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.