Achim Steiner

Achim Steiner est le directeur exécutif du Programme des Nations Unies pour l'Environnement (PNUE). Auparavant, il a exercé de hautes fonctions à la Commission mondiale des barrages puis à l'Union internationale pour la conservation de la nature (IUCN).

Photo ©AFP PHOTO / Tony KARUMBA

Summary / Synopsis
Governments need to urgently identify how ambition can be raised on climate
[UNEP, 21/11/2012]
 
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Action to Curb 'Soot' and 'Smog' Pollution Could Help Limit Global Temperature Rise
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UNEP: Created in 1972, UNEP, the United Nations Environment Programme, is the highest environmental authority in the United Nations system. The Programme is an “advocate, educator, catalyst and... Suite
Climate change measures must be made corruption proof
[Transparency International, 30/04/2011]
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Did Cancun Prove the UN Irrelevant in Tackling Climate?
[Fred Pearce, 16/12/2010]
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Seeing REDD on Climate Change
[George Soros, 12/12/2010]
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What to expect from the Cancun climate change conference
[Denis Loyer, 24/11/2010]
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Europe needs to reduce emissions by 30%
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[Nathalie Durand, 28/06/2010]
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A Hard Look at the Perils and Potential of Geoengineering
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[Khadija Sharife is a South African journalist. She is also an activist and a scholar at the Centre for Civil Society (CCS) at the University of KwaZulu-Natal, South Africa and a contributing author to the Tax Justice Network., 27/02/2010]
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Why scientists must be the new climate sceptics
[New Scientist, 04/03/2010]
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Copenhagen - Historic failure that will live in infamy
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[Olivier Milhomme, 21/12/2009]
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Copenhagen: Seattle Grows Up
[Naomi Klein, 13/11/2009]
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[Carl Zimmer, 23/09/2009]
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Why Cutting Carbon Emissions is not Enough
[Achim Steiner, 01/09/2009]
Why Cutting Carbon Emissions is not Enough Achim Steiner est le directeur exécutif du Programme des Nations Unies pour l'Environnement (PNUE). Auparavant, il a exercé de hautes fonctions à la Commission mondiale des barrages puis à l'Union... Suite
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From Carbon Insolvency to Climate Dividends
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[New Scientist, 25/06/2009]
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The Other Carbon Economy
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[Adam Ma’anit, 30/07/2006]
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GM crops may reduce greenhouse gases
[New Scientist, 29/01/2007]
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Why Cutting Carbon Emissions is not Enough

24/09/2009 11:07 am

Twenty years ago, governments adopted the Montreal Protocol, a treaty to protect the Earth’s ozone layer from emissions of destructive chemicals. Few could have foreseen how far-reaching that decision would prove to be.

 

The Protocol explicitly aimed at phasing-out substances such as chlorofluorocarbons (CFCs) – found in products such as refrigerators, foams, and hairsprays – in order to repair the thin gassy-shield that filters out the sun’s harmful, ultra-violet rays. By 2010, close to 100 ozone-depleting substances, including CFCs, will have been phased-out globally.

 

Without the decisions taken 20 years ago, atmospheric levels of ozone-depleting substances would have increased ten-fold by 2050. This could have led to up to 20 million additional cases of skin cancer and 130 million more cases of eye cataracts, not to speak of damage to human immune systems, wildlife, and agriculture.

 

But this is only part of the story that we celebrate on the International Day for the Preservation of the Ozone Layer (September 16). Over the past two years, it has been established that the Montreal Protocol has also spared humanity a significant level of climate change, because the gases that it prohibits also contribute to global warming.

 

Indeed, a study in 2007 calculated the climate mitigation benefits of the ozone treaty as totalling the equivalent of 135 billion tons of CO2 since 1990, or a delay in global warming of 7-12 years.

 

So the lessons learned from the Montreal Protocol may have wider significance. Scientists now estimate that somewhere close to 50% of climate change is being caused by gases and pollutants other than CO2, including nitrogen compounds, low-level ozone formed by pollution, and black carbon. Of course, a degree of scientific uncertainty about some of these pollutants’ precise contribution to warming remains. But they certainly play a significant role.

 

Meanwhile, many of these gases need to be curbed because of their wider environmental impact on public health, agriculture, and the planet’s multi-trillion dollar ecosystems, including forests.

 

Consider black carbon, a component of the soot emissions from diesel engines and the inefficient burning of biomass cooking stoves that is linked to 1.6 million to 1.8 million premature deaths annually as a result of indoor exposure and 800,000 as a result of outdoor exposure. Black carbon, which absorbs heat from the sun, also accounts for anywhere from 10% to more than 45% of the contribution to global warming, and is also linked to accelerated losses of glaciers in Asia, because the soot deposits darken, ice making it more vulnerable to melting.

 

One study estimates that 26% of black carbon emissions are from stoves for heating and cooking, with more than 40% of this amount from wood burning, roughly 20% from coal, 19% from crop residues, and 10% from dung.

 

Some companies have developed stoves that use passive air flows, better insulation, and 60% less wood to reduce black carbon emissions by around 70%. Mass introduction of such stoves could deliver multiple green-economy benefits.

 

While CO2 can remain in the atmosphere for centuries, other pollutants, including black carbon and ozone, remain for relatively periods – days, weeks, months, or years – so that reducing or ending emissions promises almost immediate climate benefits.

 

The international community’s over-arching concern must be to seal a serious and significant deal at the United Nations climate summit in Copenhagen in December to curtail C02 emissions and assist vulnerable countries to adapt. If the world also is to deploy all available means to combat climate change, emissions of all substances that contribute to it must be scientifically evaluated and urgently addressed.

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Why Cutting Carbon Emissions is not Enough

Achim Steiner

Copyright : Project Syndicate, 2009.
www.project-syndicate.org

]