Global Temperature Could Exceed 1.5°C in Just 12 Years: UN (IPCC) Special Report (Download PDF)


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UN Intergovernmental Panel on Climate Change (IPCC) has released special report on global warming in Incheon, South Korea. Report includes contributions from 91 authors & review editors from 40 countries.

Image of Global Mean Surface Temperature

Image of Global Mean Surface Temperature

Image of Global Mean Surface Temperature

It will be key scientific input in upcoming Katowice Climate Change Conference in Poland in December 2018.

Key Points from UN Intergovernmental Panel on Climate Change Report

  • It clearly shows how half degree of warming makes big difference, adversely impacting global population & overall ecosystem thru intense heat waves, melting of Arctic, sea level rise, erratic rainfall, reduction of farm yield & vanishing of living species.

  • It is possible to complete new warming target, provided nations together take rapid & far reaching transitions over next 10 - 20 years in energy, industry, land use, buildings, transport & cities to cut emissions & reach net zero around 2050 - 25 years earlier than planned under earlier 20 goal.

  • It lists 4 pathways to curb global warming & thru which 1.50 target can be achieved.

  • In each of pathways, global average temp. is projected to overshoot 1.50 C target by some amount before returning to that level before end of this century.

  • Each of these pathways is dependent on some amount of Carbon Dioxide Removal (CDR), reference to physical removal of stock of CO2 from atmosphere to reduce its concentrations.

  • Varying amounts b/w 100 - 1000 gigatons (billion tonnes) of CO2 needs to be removed from atmosphere in these 4 pathways.

  • It refers to climate models that project robust differences in regional climate characteristics b/w present-day & global warming of 1.50 C & b/w 1.50 & 20 C.

  • These differences include increase in mean temp. in both land ocean regions, hot extremes in most inhabited regions, heavy precipitation in several regions & probability of drought & precipitation deficits in some regions.

Image of Key points from UN (IPCC) Report

Image of Key Points from UN (IPCC) Report

Image of Key points from UN (IPCC) Report

Advantages of Keeping Global Temp. Rise W/I 1.50C

  • It also lists several specific advantages of keeping the global temperature rise within 1.5 degrees celsius from pre-industrial levels.

  • By 2100, global sea level rise would be 10 cm lower with global warming of 1.5 degrees compared with 2 degrees Celsius.

  • Arctic Ocean free of sea ice in summer would be once per century with global warming of 1.50, compared w/at least once per decade w/20C.

  • Coral reefs will decline by 70 - 90 % w/global warming of 1.50, whereas virtually all (over 99%) would be lost w/20C.

  • It points out that climate-related risks to health, livelihoods, food security, water supply, human security & economic growth are projected to increase w/global warming of 1.50C & increase further w/20C.

Intergovernmental Panel on Climate Change (IPCC)

  • IPCC is leading international body for assessment of climate change.

  • Established in – 1988

  • Established by United Nations Environment Programme (UNEP) & World Meteorological Organization (WMO).

  • Headquartered in Geneva, Switzerland.

  • Currently members - 195 countries.

  • It comprises group of several hundred scientists of diff. nationality who assess climate change science.

  • Every 5 or 6 years, IPCC comes out w/comprehensive periodic reports on Climate Change called Assessment Reports (AR).

  • Functions:

    • IPCC neither monitors climate related parameters or data nor does it conduct any research work.

    • It merely assesses most recent scientific, socio-economic & technical information produced worldwide relevant to understanding of climate change.

  • Awards: IPCC’s 4th AR had helped them to win Nobel Peace Prize in 2007. During this time R. K. Pachauri was its Chairman.

- Published/Last Modified on: January 17, 2019

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