2006.10.13

Cosa è successo:

recentemente una persona che lavora per Slow Food mi ha informata di un protocollo di intesa fra GRTA altra associazione che ha sede a Cesena presso lo stesso indirizzo dove è posta la sede legale di Civiltà Contadina, di cui gli Zavalloni sono soci e che occasionalmente collabora con Civiltà Contadina, e Slow Food per progetti sulle scuole e quasi contemporaneamente Gianfranco Zavalloni mi ha chiamato per un incontro sugli orti scolastici in cui discutere di proposte...

(continua)

[Presidio Slow Food]

Le origini delle saline di Cervia si perdono nell'antichità classica; qualcuno le ricollega alla presenza etrusca, altri alla colonizzazione greca citando, a sostegno di tale tesi, il vecchio toponimo di Cervia, Ficocle, di sicura origine greca...

(continua)

[Presidio Slow Food]

Pera briaca, pera Cocomera o meglio ancora, date le dimensioni mignon, pera Cocomerina: sono i nomignoli quasi affettuosi, da fiaba per i bimbi, con i quali si definisce la piccola pera coltivata ancora sull'Appennino Cesenate...

(continua)

[Sloweb]

Sono state raccolte le prime "noccioline" seminate nella Pianura Padana come alternativa alle coltivazioni tradizionali, per combattere i cambiamenti climatici che provocano ricorrente siccità anche nelle regioni del nord Italia...

(continua)

[Bio@gricultura Notizie]

Via libera da Bruxelles ai trucioli di legno nel vino, ma con l'obbligo di indicarne l'uso in etichetta. Queste in sintesi le conclusioni della Commissione Europea che stamatttina a Bruxelles ha autorizzato anche in Europa una pratica enologica già in uso tra i produttori americani, sudafricani e australiani. L'Italia ha indicato che l'impiego dei trucioli per le pratiche "d'invecchiamento" sarà consentito solo per i vini da tavola, escludendo quindi Doc, Docg e Igt. "Pur essendo soddisfatti per l'obbligo di darne menzione in etichetta siamo comunque contrari a una pratica enologica che, secondo alcuni esperti della materia, potrebbe indurre danni alla salute - ha commentato Floriano Zambon, presidente di Città del Vino -. Pensiamo tuttavia che il provvedimento rispetti il consumatore nel suo diritto di essere informato e le cantine che fanno qualità nel loro interesse a una concorrenza leale sul mercato". (Ufficio stampa Città del Vino - 0577/271579)

[neurogreen@liste.rekombinant.org]

Climate change: 'One degree and we're done for'

27 September 2006

From New Scientist Print Edition

Fred Pearce

"Further global warming of 1 °C defines a critical threshold. Beyond that we will likely see changes that make Earth a different planet than the one we know."

So says Jim Hansen, director of NASA's Goddard Institute for Space Studies in New York. Hansen and colleagues have analysed global temperature records and found that surface temperatures have been increasing by an average of 0.2 °C every decade for the past 30 years. Warming is greatest in the high latitudes of the northern hemisphere, particularly in the sub-Arctic boreal forests of Siberia and North America. Here the melting of ice and snow is exposing darker surfaces that absorb more sunlight and increase warming, creating a positive feedback.

Earth is already as warm as at any time in the last 10,000 years, and is within 1 °C of being its hottest for a million years, says Hansen's team. Another decade of business-as-usual carbon emissions will probably make it too late to prevent the ecosystems of the north from triggering runaway climate change, the study concludes (Proceedings of the National Academy of Sciences, vol 103, p 14288).

The analysis reinforces a series of recent findings on accelerating environmental disruption in Siberia, northern Canada and Alaska, underlining a growing scientific consensus that these regions are pivotal to climate change. Earlier this month, NASA scientists reported that climate change was speeding up the melting of Arctic sea ice. Permanent sea ice has contracted by 14 per cent in the past two years (Geophysical Research Letters, vol 33, L17501). However, warming and melting have been just as dramatic on land in the far north.

A meeting on Siberian climate change held in Leicester, UK, last week confirmed that Siberia has become a hotspot of global climate change. Geographer Heiko Balzter, of the University of Leicester, said central Siberia has warmed by almost 2 °C since 1970 - that's three times the global average.

Meanwhile, Stuart Chapin of the University of Alaska Fairbanks this week reported that air temperatures in the Alaskan interior have risen by 2 °C since 1950, and permafrost temperatures have risen by 2.5 °C (Proceedings of the National Academy of Sciences, DOI: 10.1073/pnas.0606955103).

In Siberia the warming is especially pronounced in winter. "It has caused the onset of spring to advance by as much as one day a year since satellite observations began in 1982," says Balzter. Similarly, Alaskan springs now arrive two weeks earlier than in 1950, according to Chapin.

The Leicester meeting heard that the rising temperatures are causing ecological changes in the forests that ratchet up the warming still further. Vladimir Petko from the Russian Academy of Sciences Forest Research Institute in Krasnoyarsk says warm springs are triggering plagues of moths. "They can eat the needles of entire forest regions in one summer," he says. The trees die and then usually succumb to forest fires that in turn destroy soil vegetation and accelerate the melting of permafrost, Petko says.

In 2003 Siberia saw a record number of forest fires, losing 40,000 square kilometres according to Balzter, who has analysed remote sensing images of the region. Similar changes are occurring in Alaska. According to Chapin, warming there has shortened the life cycle of the bark beetle from two years to one, causing huge infestations and subsequent fires, which destroyed huge areas of forest in 2004. "The current boreal forest zone could be so dried out by 2090 that the trees will die off and be replaced by steppe," says Nadezhda Tchebakova, also at the institute in Krasnoyarsk.

Melting permafrost in the boreal forests and further north in the Arctic tundra is also triggering the release of methane, a powerful greenhouse gas, from thick layers of thawing peat. First reports published exclusively in New Scientist last year (13 August 2005, p 12) were recently confirmed by US scientists (Nature, vol 443, p 71).

"Large amounts of greenhouse gases are currently locked in the permafrost and if released could accelerate the greenhouse effect," says Balzter. Hansen's paper concludes that the effects of this positive feedback could be huge. "In past eras, the release of methane from melting permafrost and destabilised sediments on continental shelves has probably been responsible for some of the largest warmings in the Earth's history," he says.

"The release of methane from melting permafrost has been responsible for some of the largest warmings in history"We could be close to unleashing similar events in the 21st century, Hansen argues. Although the feedbacks should remain modest as long as global temperatures remain within the range of recent interglacial periods of the past million years, outside that range - beyond a further warming of about 1 °C - the feedbacks could accelerate. Such changes may become inevitable if the world does not begin to curb greenhouse gas emissions within the next decade, Hansen says.

Meanwhile, another new study underlines that the boreal peat bogs, permafrost and pine forests are not just vital to the planet as a whole, they are major economic assets for the countries that host them. A detailed study of the northern boreal forests by environmental consultant Mark Anielski of Edmonton, Canada, puts the value of their "ecosystem services" at $250 billion a year, or $160 per hectare.

"The value of the services this ecosystem performs is more than twice that of the resources taken from the region each year"These benefits include flood control, water purification and pest control provided by forest birds, plus income from wilderness tourism and meat from wildlife such as caribou. Anielski presented his findings to Canada's National Forest Congress in Gatineau-Ottawa earlier this week.

The value of these ecosystem services is more than twice that of conventional resources taken from the region each year, such as timber, minerals, oil and hydroelectricity, Anielski says. "If they were counted in Canadian inventories of assets, they would amount to roughly 9 per cent of our gross domestic product - similar in value to our health and social services."

You can add to that figure the value of having such a huge volume of carbon locked away. "The boreal region is like a giant carbon bank account," he says. "At current prices in the European carbon emissions trading system, Canada's stored carbon alone would be worth $3.7 trillion."

And if Hansen is right that the carbon and methane stored in the boreal regions has the potential to transform the world into "another planet", then the boreal region may be worth a great deal more than that.

From issue 2571 of New Scientist magazine, 27 September 2006, page 8-9