World has warmed up 1.5°C

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The world has warmed by approximately 1.5°C above pre-industrial levels, a significant milestone that has been discussed and analyzed in various scientific reports and articles. This warming is attributed to human activities, particularly the emission of greenhouse gases from the burning of fossil fuels, deforestation, and other industrial processes4511. Research using 300-year-old sponges suggests that by the time official temperature records began, global temperatures had already risen by half a degree, indicating that the 1.5°C increase may have been reached earlier than previously thought17. The Intergovernmental Panel on Climate Change (IPCC) has released a special report on the impacts of global warming of 1.5°C above pre-industrial levels, which outlines the significant consequences for natural and human systems, and emphasizes the importance of limiting warming to this level to reduce risks215. At 1.5°C of warming, many of the deadliest effects of climate change are reduced compared to higher levels of warming, such as 2°C. For example, sea level rise is expected to be around 10cm lower at 1.5°C compared with 2°C. However, even at 1.5°C, irreversible melting of ice sheets and other serious impacts are possible3. The difference in impacts between 1.5°C and 2°C is substantial, with every tenth of a degree of warming leading to more severe consequences38. The 1.5°C threshold is not a safe level of warming, but rather an aspirational target agreed upon internationally to avoid the worst impacts of climate change. It is important to note that even if the global average temperature is controlled at this level, regional and seasonal variations will still lead to extreme weather events due to climate change5. The IPCC reports that over a fifth of the global population lives in regions that have already experienced warming exceeding 1.5°C above pre-industrial levels6. The current trajectory of emissions suggests that the world will exceed the carbon budget for 1.5°C of warming in just over five years, highlighting the urgency for immediate and significant reductions in greenhouse gas emissions9. In summary, the world has warmed by approximately 1.5°C above pre-industrial levels, and this warming has significant implications for the planet's climate and ecosystems. Efforts to limit warming to this level are crucial to mitigate the worst impacts of climate change2356915.
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