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IPCC: Limiting global warming to 1.5°C requires rapid and far-reaching change

by The Editorial Team
October 9, 2018
in Emissions, Sustainability
IPCC: Limiting global warming to 1.5°C requires rapid and far-reaching change

Credit: NASA / The Earth, an image created from photographs taken by the Suomi NPP satellite.

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Limiting global warming to 1.5°C would require rapid, far-reaching and unprecedented changes in all aspects of society, the Intergovernmental Panel on Climate Change (IPCC) said in a new report, noting that limiting global warming to 1.5°C compared to 2°C could go hand in hand with ensuring a more sustainable and equitable society.

The Special Report on Global Warming of 1.5°C was created after invitation from the United Nations Framework Convention on Climate Change (UNFCCC) when it adopted the Paris Agreement in 2015 and it was now approved by the IPCC on Saturday in Incheon, Republic of Korea.

With more than 6,000 scientific references, 91 authors and review editors from 40 countries, it will be a key scientific input into the Katowice Climate Change Conference in Poland in December, when governments review the Paris Agreement to tackle climate change.

The ‘Global Warming of 1.5°C’ report focuses on the impacts of global warming of 1.5°C above pre-industrial levels and related global greenhouse gas emission pathways, in the context of strengthening the global response to the threat of climate change, sustainable development, and efforts to eradicate poverty.

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One of the key messages that comes out very strongly from this report is that we are already seeing the consequences of 1°C of global warming through more extreme weather, rising sea levels and diminishing Arctic sea ice, among other changes,

…said Panmao Zhai, Co-Chair of IPCC Working Group I.


Key findings

The report highlights a number of climate change impacts that could be avoided by limiting global warming to 1.5°C compared to 2°C, or more. For instance, by 2100:

  • global sea level rise would be 10 cm lower with global warming of 1.5°C compared with 2°C;
  • the likelihood of an Arctic Ocean free of sea ice in summer would be once per century with global warming of 1.5°C, compared with at least once per decade with 2°C;
  • coral reefs would decline by 70-90% with global warming of 1.5°C, whereas virtually all (> 99%) would be lost with 2°C.

Every extra bit of warming matters, especially since warming of 1.5°C or higher increases the risk associated with long-lasting or irreversible changes, such as the loss of some ecosystems,

…noted Hans-Otto Pörtner, Co-Chair of IPCC Working Group II. Limiting global warming would also give people and ecosystems more room to adapt and remain below relevant risk thresholds, he added.

An interesting BBC infographic made by Matt McGrath summarizes the five key takeaways of the IPCC report:

Credit: BBC

The report also examines pathways available to limit warming to 1.5°C, what it would take to achieve them and what the consequences could be.

The good news is that some of the kinds of actions that would be needed to limit global warming to 1.5°C are already underway around the world, but they would need to accelerate,

…noted Valerie Masson-Delmotte, Co-Chair of Working Group I.

The report finds that:

  • Limiting global warming to 1.5°C would require “rapid and far-reaching” transitions in land, energy, industry, buildings, transport, and cities.
  • Global net human-caused emissions of carbon dioxide (CO2) would need to fall by about 45% from 2010 levels by 2030, reaching ‘net zero’ around 2050. This means that any remaining emissions would need to be balanced by removing CO2 from the air.
  • Allowing the global temperature to temporarily exceed or ‘overshoot’ 1.5°C would mean a greater reliance on techniques that remove CO2 from the air to return global temperature to below 1.5°C by 2100. The effectiveness of such techniques are unproven at large scale and some may carry significant risks for sustainable development.

This report gives policymakers and practitioners the information they need to make decisions that tackle climate change while considering local context and people’s needs. The next few years are probably the most important in our history,

…said Debra Roberts, Co-Chair of IPCC Working Group II.


Tweeting shortly after the report was launched, UN Secretary-General António Guterres said that it is not impossible to limit global warming to 1.5°C, according to the report, ‘but it will require unprecedented and collective climate action in all areas. There is no time to waste‘.

The report was prepared under the scientific leadership of all three IPCC working groups. Working Group I assesses the physical science basis of climate change; Working Group II addresses impacts, adaptation and vulnerability; and Working Group III deals with the mitigation of climate change.

The Paris Agreement adopted by 195 nations at the 21st Conference of the Parties to the UNFCCC in December 2015 included the aim of strengthening the global response to the threat of climate change by “holding the increase in the global average temperature to well below 2°C above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5°C above pre-industrial levels.”

Global Warming of 1.5°C is the first in a series of Special Reports to be produced in the IPCC’s Sixth Assessment Cycle. Next year the IPCC will release the Special Report on the Ocean and Cryosphere in a Changing Climate, and Climate Change and Land, which looks at how climate change affects land use.

Explore the IPCC report’s summary for policymakers herebelow:

Tags: climate changeCO2global warmingParis Agreementreducing shipping emissionsreportsUN

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