A new report by the Intergovernmental Panel on Climate Change (IPCC) has warned that
global warming may exceed 1.5°C, unless deep reductions in CO2 and other greenhouse gas emissions occur in the coming decades.
It said there was a need for immediate, rapid and large-scale reductions in greenhouse gas emissions, except which limiting warming to close to 1.5°C or even 2°C will be beyond reach.
Scientists according to the report observed that many of the changes observed in the climate are unprecedented in thousands,such as continued sea level rise which are irreversible over hundreds to thousands of years.
It said only strong and sustained reductions in emissions of carbon dioxide (CO2) and other greenhouse gases would limit climate change.
It predicted that while benefits for air quality would come quickly, it could take 20-30 years to see global temperatures stabilize
The IPCC Working Group I report, Climate Change 2021: the Physical Science Basis, was approved on Friday by 195 member governments of the IPCC, through a virtual approval session.
The Working Group I report is the first instalment of the IPCC’s Sixth Assessment Report (AR6), which will be completed in 2022.
“This report reflects extraordinary efforts under exceptional circumstances,” said Hoesung Lee, Chair of the IPCC. “The innovations in this report, and advances in climate science that it reflects, provide an invaluable input into climate negotiations and decision-making.”
The report also shows that emissions of greenhouse gases from human activities are responsible for approximately 1.1°C of warming since 1850-1900, and finds that averaged over the next 20 years, global temperature is expected to reach or exceed 1.5°C of warming.
It said the assessment is based on improved observational datasets to assess historical warming, as well progress in scientific understanding of the response of the climate system to human-caused greenhouse gas emissions.
“This report is a reality check,” said IPCC Working Group I Co-Chair Valérie Masson-Delmotte. “We now have a much clearer picture of the past, present and future climate, which is essential for understanding where we are headed, what can be done, and how we can prepare.”