No menu items!

COSTA RICA'S LEADING ENGLISH LANGUAGE NEWSPAPER

HomeArchiveU.N. panel warns of rising temperatures, blames humankind

U.N. panel warns of rising temperatures, blames humankind

STOCKHOLM – The U.N.’s climate panel said Friday it was more certain than ever that humans were the cause of global warming and predicted temperatures would rise another 0.3 to 4.8 degrees Celsius (0.5-8.6 degrees Fahrenheit) this century.

Heatwaves, floods, droughts and rising seas are among the threats that will intensify through warming, the Intergovernmental Panel on Climate Change (IPCC) said in a report released in Stockholm.

Environmental activists, scientists and leading politicians said the long-awaited review of climate science proved fossil-fuel burning must be urgently curbed.

In a government-approved summary, the Nobel-winning group said it was “extremely likely” – a term meaning it was 95-percent convinced – that humans caused most of the warming observed over the past 60 years.

In its last report in 2007, the panel had put this at 90 percent.

U.N. climate chief Christiana Figueres, from Costa Rica, said the report was “an alarm-clock moment for the world.”

“To steer humanity out of the high danger zone, governments must step up immediate climate action and craft an agreement in 2015” against greenhouse gases, she said.

U.S. Secretary of State John Kerry also urged strong action, labelling the report “yet another wakeup call.”

“Those who deny the science or choose excuses over action are playing with fire,” he said.

The volume is the first of a trilogy summarizing the status of global warming and its impacts.

The IPCC has delivered four previous assessments in its 25-year history.

Each edition has sounded an ever-louder drumbeat to warn that temperatures are rising and the risk to the climate system is accentuating.

The projections for this century are based on computer models of trends in heat-trapping greenhouse gas emissions, especially from coal, oil and gas which provide the backbone of energy supply today.

The most optimistic of four warming scenarios sees an average temperature rise of 1.0 C (1.8 F) by 2100 over 2000 levels, ranging from 0.3 to 1.7 C (0.5-3.1 F). This is the only scenario that can safely meet the U.N.’s target of 2 C (3.6 F), which also factors in warming from the start of the Industrial Revolution to 2000.

By comparison, the highest IPCC scenario has an average warming this century of 3.7 C (6.7 F), ranging from 2.6 C (4.7 F) to a 4.8 C (8.6 F) – a maximum many experts deem catastrophic.

“Global surface temperature change for the 21st century is projected to be likely to exceed 1.5 C relative to 1850-1900 in all but the lowest scenario considered,” said Thomas Stocker, co-chairman of the working group that authored the report.

‘Unbiased assessments’ of climate change

Heatwaves this century “very likely” will be more frequently and longer, he said, with added risk of floods and droughts in a warmer world.

Depending on how much carbon gas enters the atmosphere, sea levels will rise by between 26 and 82 centimetres (10.4 and 32.8 inches) by 2100, the report added.

Climate skeptics have pointed to a slowdown in warming over the last 10 to 15 years as proof that scientists’ models are flawed – or that global warming is a green scare.

The IPCC acknowledged the slowdown but noted the decade ending 2010 was still the warmest on record and was marked by extreme weather events.

It also cautioned against arbitrarily selecting dates to justify an argument.

Thirty years or more are needed to see whether any slowdown was for real or just a quirk, said Stocker.

World Meteorological Organisation (WMO) chief Michel Jarraud warned that climate change effects could last centuries.

“Our activities today will have a profound effect on society, not just for us but for many generations to come,” he told a press conference.

In a video statement, U.N. Secretary General Ban Ki-moon said the report was “essential” for governments thrashing out an ambitious global deal by 2015 on curbing greenhouse gas emissions.

Ban will host a summit in September 2014 to boost political commitment to reach the 2 C target, a level that some experts say will avoid the worst climate fallout.

“The heat is on,” said the U.N. chief. “Now we must act.”

Political interest in climate change dwindled after a near-disastrous U.N. summit in Copenhagen in 2009, and willingness for concessions has fallen back in developed countries still reeling from the 2008 financial crisis.

To safely reach the 2 C target, carbon emissions would have to peak by 2020 and then fall dramatically over the next half century, according to previous research.

The report said mankind has already used 53 percent of the emissions allocation that would make 2 C possible – a trillion tons of carbon.

The work released Friday comprises a 2,000-page report authored by 257 scientists, plus a 36-page Summary for Policymakers.

Two more volumes of the Fifth Assessment Report will be released next year.

Trending Now

2025 Gold Cup: Honduras Advances After Dramatic Shootout, Mexico Ends Goal Drought

Honduras, with a surprising and dramatic penalty shootout victory over Panama, and Mexico, with a lackluster win against Saudi Arabia, advanced Saturday to the...

A Costa Rica Love Story: From Rustic Cabina to Separate Dreams

My Tica wife and I have been together for over a quarter century. When we met, I was living a simple life here. Three...

Life After MS-13 in El Salvador as Residents Seek a Fragile Peace

Esperanza Martinez lost three relatives who were murdered and saw numerous bodies left in the streets of her neighborhood, a former stronghold of the...

Costa Rica to Launch Electric Air Taxis for Sustainable Travel in Guanacaste

Costa Rica is poised to revolutionize its transportation landscape with the introduction of electric air taxis, offering a sustainable alternative to traditional ground travel...

Why Costa Rica Feels Like a Safe Haven for This Longtime Expat

If someone asked me to sum up why I live in Costa Rica in 5 words or less, my answer could well be: “It...

Costa Rica’s Eyelash Viper Snake Is One of the Most Beautiful

There are at least 141 different species of snakes in Costa Rica. With that large number of species packed into such a tiny nation,...
Avatar
spot_img
Costa Rica Tours
Costa Rica Coffee Maker Chorreador
Costa Rica Coffee Maker Chorreador
Costa Rica Travel Insurance
Costa Rica Rocking Chait
Costa Rica Travel

Latest News from Costa Rica