Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. 24/7 Space News .




CLIMATE SCIENCE
Climate: Geo-engineering no Holy Grail - study
by Staff Writers
Paris (AFP) Feb 25, 2014


Far from offering a simple fix, sci-fi solutions to global warming may in fact make the problem worse, a probe of "geo-engineering" options said on Tuesday.

Once mocked as unscientific, geo-engineering proposals are gaining traction as carbon emissions soar, placing Earth on track for warming of maybe four degrees Celsius (7.2 degrees Fahrenheit) by 2100.

Ideas, mainly experimental or untested, include building mirrors in space to reflect the Sun's rays or growing plankton to boost absorption of heat-trapping carbon dioxide (CO2).

The goal is to buy time to wean the global economy off the cheap but dirty energy sources driving man-made climate change.

But on current emissions trends, these technologies stand little chance of rolling back warming to the UN-targeted 2 C (3.6 F) and may well make matters worse, according to the most comprehensive study yet.

"Climate engineering alone is not a good solution to prevent climate change," said David Keller of the Helmholtz Centre for Ocean Research in Kiel, Germany, who co-authored the paper.

Reporting in the journal Nature Communications, the team devised a computer model to project the impact of five geo-engineering proposals under a scenario of continuing high carbon emissions.

The five schemes entail:

-- planting large forests to absorb CO2 from the atmosphere and store it,

- fertilising the oceans with iron to stimulate the growth of plankton, which would absorb more CO2 from the sea surface through photosynthesis,

-- using long pipes to pump deep, cold, nutrient-rich water to the surface to fertilise plankton,

-- "alkalising" the ocean with limestone to cause a chemical reaction to absorb more CO2 from the atmosphere, and

-- using solar radiation management (SRM): placing reflective particles in the atmosphere or mirrors in space to reflect the Sun's rays.

Even with the technologies combined and applied to the widest extent possible, these options would not prevent mean surface temperatures from rising beyond 2C target if CO2 emissions continue as they are, the simulation found.

- 'Abject stupidity' -

The side effects "could be as bad as the climate change effects that they are trying to prevent," Keller warned.

The study found that SRM was the only method with the potential to swiftly reduce warming.

But it also had some of the largest potential side effects, such as changing rain patterns -- and could never be stopped without instantly warming the planet.

Geo-engineering could also boost sea levels, reduce the surface reflectiveness (albedo) in some regions of the world and cause higher local temperatures, remove oxygen from the ocean, and deplete the ozone layer.

"Our simulations suggest that the potential for these types of climate engineering to make up for failed mitigation may be very limited," said the study.

The UN's Intergovernmental Panel on Climate Change (IPCC) reported last year that SRM, "if realisable", had the potential to offset a global temperature rise -- but would also modify the global water cycle and fail to reduce ocean acidification.

As well as environmental risks, geo-engineering projects carry an unknown economic cost and face legal and political hurdles, previous research has found.

The authors of the study conclude it would be better to focus on curbing emissions, though engineering could "complement" mitigation efforts.

Their simulation was based on the so-called RCP8.5 emissions scenario, the highest used by the UN's climate panel, which expects average warming of 3.7 C by 2100.

Commenting on the new study, University of Bristol natural hazards lecturer Matt Watson said it was clear no single method or technology would solve the climate change problem.

While more research was needed, "the paper sounds a timely warning about the abject stupidity of relying upon climate engineering solutions when reducing our reliance on carbon-based energy systems is the only sensible option," he said.

.


Related Links
Climate Science News - Modeling, Mitigation Adaptation






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





UAV Payloads 2014, 24 - 25 June - London, UK
CLIMATE SCIENCE
US high court mulls greenhouse gas limits
Washington (AFP) Feb 24, 2014
The US government defended its regulation of greenhouse gas emissions from power plants before the Supreme Court on Monday, after coming under attack from industry and Republicans alike. The top court is not expected to rule until June on the policy, which requires new power plants, factories and other stationary industrial sites to use the latest energy-efficient technologies. Republica ... read more


CLIMATE SCIENCE
Is Yutu Stuck?

Japan's Pocari Sweat bound for the moon: maker

Lunar ownership laws: a future necessity?

Chang'e-2 lunar probe travels 70 mln km

CLIMATE SCIENCE
NASA Mars Orbiter Views Opportunity Rover on Ridge

Curiosity Adds Reverse Driving for Wheel Protection

Curiosity Drives On After Crossing Martian Dune

The World Above and Beyond

CLIMATE SCIENCE
Orion Underway Recovery Testing Begins off the Coast of California

Inside astronaut Alexander's head

NASA Welcomes University Participants to Develop Science Payloads

Boeing Commercial Crew Program Passes NASA Hardware, Software Reviews

CLIMATE SCIENCE
No Call for Yutu

What's up, Yutu

China's Jade Rabbit rover comes 'back to life'

Yutu Awakes

CLIMATE SCIENCE
NASA, International Space Station Partners Announce Future Crew Members

Andrews Space Cargo Module Power Unit Provides Power For Payloads Bound For ISS

Russian Progress M-22M docks with ISS following fast rendezvous

Russian Resupply Spacecraft Begins Expedited Flight to Station

CLIMATE SCIENCE
Arianespace to launch OPTSAT 3000 and VENuS satellites

Lighter engines a headache for satellite launcher Ariane

New Russian Rocket Mock-Up Rolls Out to Launch Pad

ILS Proton Successfully Launches TURKSAT-4A for Turksat

CLIMATE SCIENCE
ESA selects planet-hunting PLATO mission

Rife with hype, exoplanet study needs patience and refinement

Scientist: Exoplanet research needs less hype, more patience

Europe sets plans for 2024 planet-hunting mission

CLIMATE SCIENCE
Study finds 2 biodegradable mulches to be suitable polyethylene alternatives

Novel optical fibers transmit high-quality images

Lagos gets on its bike with recycling 'loyalty' scheme

How to catch a satellite




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.