Earth To Warm More Quickly, New Climate Models Show
Faizan Hashmi Published September 17, 2019 | 02:40 PM
Paris, Sept 17 (UrduPoint / Pakistan Point News - 17th Sep, 2019 ) :Greenhouse gases thrust into the atmosphere by burning fossil fuels are warming Earth's surface more quickly than previously understood, according to new climate models set to replace those used in current UN projections, scientists said Tuesday.
By 2100, average temperatures could rise 6.5 to 7.0 degrees Celsius above pre-industrial levels if carbon emissions continue unabated, separate models from two leading research centres in France showed.
That is up to two degrees higher than the equivalent scenario in the Intergovernmental Panel for Climate Change's (IPCC) 2014 benchmark 5th Assessment Report.
The new calculations also suggest the Paris Agreement goals of capping global warming at "well below" two degrees, and 1.5C if possible, will be harder to reach, the scientists said.
"With our two models, we see that the scenario known as SSP1 2.6 -- which normally allows us to stay under 2C -- doesn't quite get us there," Olivier Boucher, head of the Institute Pierre Simon Laplace Climate Modelling Centre in Paris, told AFP.
With barely one degree Celsius of warming so far, the world is already coping with increasingly deadly heat waves, droughts, floods and tropical cyclones made more destructive by rising seas.
A new generation of 30-odd climate models known collectively as CMIP6 -- including the two unveiled Tuesday -- will underpin the IPCC's next major report in 2021.
"CMIP6 clearly includes the latest modelling improvements," even as important uncertainties remain, Joeri Rogelj, an associate professor at Imperial College London and an IPCC lead author, told AFP.
These include increased supercomputing power and sharper representations of weather systems, natural and man-made particles, and how clouds evolve in a warming world.
"We have better models now," said Boucher. "They have better resolution, and they represent current climate trends more accurately." - 'Tipping points' - A core finding of the new models is that increased levels of CO2 in the atmosphere will warm Earth's surface more easily than earlier calculations had suggested.
If confirmed, this higher "equilibrium climate sensitivity", or ECS, means humanity's carbon budget -- our total emissions allowance -- is likely to shrink.
The French models are among the first to be released, but others developed independently have come to the same unsettling conclusion, Boucher confirmed.
"The most respected ones -- from the United States, and Britain's Met Office -- also show a higher ECS" than the previous generation of models, he said.
This is bad news for fight against global warming, which continues to face strong political headwinds and institutional inertia despite a rapid crescendo of public awareness and concern.
"A higher ECS means a greater likelihood of reaching higher levels of global warming, even with deeper emissions cuts," Boucher and two British scientists -- Stephen Belcher from the UK Met Office and Rowan Sutton from the UK National Centre for Atmospheric Science -- wrote in a blog earlier this year, tiptoeing around the implications of the new models.
"Higher warming would allow less time to adapt and mean a greater likelihood of passing climate 'tipping points' such as thawing of permafrost, which would further accelerate warming." A third to 99 percent of top-layer permafrost could melt by 2100 if carbon pollution is not abated, releasing billions of tonnes of greenhouse gases into the air, according to a draft IPCC special report on oceans and Earth's frozen zones obtained by AFP.
"Unfortunately, our global failure to implement meaningful action on climate change over recent decades has put us in a situation where what we need to do to keep warming to safe levels is extremely simple," said Rogelj.
"Global greenhouse gas emissions need to decline today rather than tomorrow, and global CO2 emissions should be brought to net zero."The 2014 basket of climate models show Earth warming on current trends an additional 3C by 2100, and at least 2C even if national carbon cutting pledges are all met.
The two French climate models, including one from France's National Centre for Meteorological Research (CNRM), were to be unveiled at a press conference in Paris.
Related Topics
Recent Stories
Rawalpindi woman gives birth to six babies
Kenya Army Chief Francis Ogola among nine others who died in Helicopter crash
Saudi FM’s visit positive, constructive one: FO
Hania enjoys vacations in London
IMF Officials assure support to Pakistan’s economy
Naqvi directs foolproof measures for protection of Chinese nationals
Israel carries out attack inside Iran, report US media
Saudi Assistant Minister of Defence calls on army chief
Currency Rate In Pakistan - Dollar, Euro, Pound, Riyal Rates On 19 April 2024
Today Gold Rate in Pakistan 19 April 2024
Rock-solid Ruud racks up season-leading win in Barcelona
At UN, Iran says it will make Israel 'regret' reprisals
More Stories From Miscellaneous
-
Transforming education sector: from job hunters to job creators
6 hours ago -
Amjad Bobby remembered on 19th death anniversary for timeless contributions to music
4 days ago -
Legendary actor Nadeem’s 26 films released on Eid-ul-Fitr days in 50 years
5 days ago -
Besant Hall Cultural Centre to celebrate evening with Sanam Marvi on 26 April
5 days ago -
Radio Bahawalpur presents program “Eidi Shidi”
8 days ago -
Radio Bahawalpur to broadcast Eid programs
10 days ago
-
DC, DPO Haripur inspect bus terminals to review fares compliance
12 days ago -
Second phase of refugees’ repatriation to start after Eidul Fitr vacations
12 days ago -
Reaping bounties as Ramazan culminates
12 days ago -
Digital transformation – a boon or bane
12 days ago -
Plants’ business: Another casualty of climate change
14 days ago -
Eid shoppers prioritize children’s joy over personal comforts
14 days ago