United Nations Intergovernmental Panel on Climate Change (IPCC) has released special report on global warming in Incheon, South Korea. The report includes contributions from 91 authors and review editors from 40 countries. It will be key scientic input in upcoming Katowice Climate Change Conference in Poland in December 2018.

Key Points from report

It clearly shows how half degree of warming makes big difference, adversely impacting global population and overall ecosystem through intense heat waves, melting of Arctic, sea level rise, erratic rainfall, reduction of farm yield and vanishing of living species. It is possible to meet new warming target, provided nations together take rapid and far reaching transitions over next 10 to 20 years in energy, industry, land use, buildings, transport and cities to cut emissions and reach net zero around 2050 — 25 years earlier than planned under earlier 2-degree goal.

It lists four pathways to curb global warming and through which the 1.5 degree target can be achieved. In each of pathways, global average temperature is projected to overshoot 1.5 degrees Celsius target by some amount before returning to that level before the end of this century. Each of these pathways is also dependent on some amount of Carbon Dioxide Removal (CDR), a reference to physical removal of stock of CO2 from atmosphere to reduce its concentrations. Varying amounts between 100 to 1000 gigatons (billion tonnes) of CO2 needs to be removed from atmosphere in these four pathways. It refers to climate models that project robust differences in regional climate characteristics between present-day and global warming of 1.5 degrees Celsius and between 1.5 and 2 degrees Celsius. These differences include increase in mean temperatures in both land ocean regions, hot extremes in most inhabited regions, heavy precipitation in several regions and probability of drought and precipitation decits in some regions.

Advantages of keeping global temperature rise within 1.5 degrees celsius

It also lists several specic 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 1.5 degrees, compared with at least once per decade with 2 degrees Celsius. Coral reefs will decline by 70-90% with global warming of 1.5 degrees, whereas virtually all (over 99%) would be lost with 2 degrees Celsius. It also points out that climate-related risks to health, livelihoods, food security, water supply, human security and economic growth are projected to increase with global warming of 1.5 degrees Celsius and increase further with 2 degrees Celsius.

Intergovernmental Panel on Climate Change (IPCC)

IPCC is the leading international body for the assessment of climate change. It was established in 1988 by the United Nations Environment Programme (UNEP) and World Meteorological Organization (WMO). It is headquartered in Geneva, Switzerland. Currently 195 countries are its members. It comprises a group of several hundred scientists of different nationality who assess climate change science. Every 5 or 6 years, IPCC comes out with 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 the most recent scientic, socioeconomic and technical information produced worldwide relevant to the 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.

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