Linkhome Documentiportfolio Videovideo Fotohistory
»
S
O
C
I
A
L

B
A
R
«
Il grado di sostenibilità dei sistemi socio-ecologici

La quantificazione di tali flussi è fondamentale per ottenere un quadro sul livello di sostenibilità dei sistemi socio-ecologici. È quello di cui si occupa la contabilità dei flussi di materia ed energia (MEFA, Material and Energy Flows Analysis), disciplina nata pochi decenni fa e oggi riconosciuta e impiegata dai principali istituti di ricerca e di statistica di tutto il mondo1.

Attraverso questa metodologia sono state realizzate delle ricerche che hanno stimato e confrontato tra loro i consumi di materia e di energia caratteristici delle tre grandi categorie di sistema socio-ecologico presenti nella storia dell’uomo. La società di cacciatori-raccoglitori ha un consumo medio di energia pro capite all’anno di 10-20 GJ (Gigajoule), la società agricola di 40-70 GJ, la società industriale di 150-400 GJ2. Il consumo di materia stimato è rispettivamente di 1 tonnellata, di 3-6 tonnellate e di 15-25 tonnellate (sempre riferendosi al periodo di un anno e relativamente a una persona). Questi dati mostrano che la transizione dal sistema agrario a quello industriale è associata ad un incremento medio nei consumi pro capite di energia e materia di 3-5 volte. L’aumento reale dei consumi è ancora superiore se consideriamo che tale transizione è inoltre associata ad un incremento medio della densità di popolazione di 10 volte (si è passati da 40 a 400 persone a Km2). A completare il quadro, la percentuale di popolazione che si occupa di agricoltura è passata da più dell’80% (nel sistema agricolo) a meno del 10% (nel sistema industriale). La produzione di biomassa è aumentata, ma mentre nel sistema agrario rappresentava più del 95% dell’energia totale impiegata, in quello industriale rappresenta solo dal 20 al 30% (Krausmann 2008).

A cura di Alice Benessia, Maria Bucci, Simone Contu, Vincenzo Guarnieri.


1 In particolare l’MFA, la metodologia di analisi dei flussi di materia, è oggi la principale metodologia di contabilità ambientale fisica impiegata ufficialmente dalle ricerche compiute da Istat, Eurostat e da organizzazioni internazionali come l’OCSE.

2 I dati si riferiscono all’indicatore di contabilità ambientale DEC (Domestic Energy Consumption) e al DMC (Domestic Material Input)


17 interventi  
  • matt ha scritto:
    16 ottobre 2014 alle 11:31
  • Alexander ha scritto:
    20 ottobre 2014 alle 05:48

    I love this site zyban cst nz Private placements are generally done without a prospectus -a document that discloses the risks associated with aninvestment and gives buyers certain legal rights if they aremisled – relying on the fact that “accredited investors” will beaware of the risks.

  • Alexa ha scritto:
    20 ottobre 2014 alle 08:17

    I’ve come to collect a parcel act amitriptyline generic fury Instead, according to Kruger, “beauty begins the moment you decide to be yourself.” By way of backing up these sentiments, Chanel also launched a series of films featuring New York City-based dermatologist and psychiatrist Dr. Amy Wechsler, who explains some of the links between how we feel and how our skin looks: “every day I see more connections between the mind and the skin.”

  • Chase ha scritto:
    20 ottobre 2014 alle 17:01

    An envelope diflucan cost without insurance Macha, who is from Peru, told rescuers that he’d been sitting on the ground and leaning against a tree Tuesday evening when the elk appeared and started heading toward him. He tried to get away, according to Utah Division of Wildlife Resources officer Dennis Shumway, but the animal ran him down, knocked him to the ground and gored him with its antlers.

  • Aiden ha scritto:
    21 ottobre 2014 alle 01:04

    Have you read any good books lately? purchase pioglitazone “We’ve started strong,” said Covered California Executive Director Peter Lee. “The amount of interest and number of applications we’ve received in the first week underscores the demand among Californians for quality, affordable healthcare.”

  • Addison ha scritto:
    21 ottobre 2014 alle 04:38

    I’d like to open an account television can generic wellbutrin make you gain weight admiration Air Force officials in April said the follow-on weather program would likely include a variety of options rather than relying on a single complex and large-scale satellite packed full of a variety of different sensors.

  • Liam ha scritto:
    21 ottobre 2014 alle 11:25

    I really like swimming inexpensive bimatoprost If she consumes too much of her product, she won’t be appearing on Shape again. But look at how the candies are described. Flirty, a fruit-flavored candy kiss, possesses lips like sugar. Now, where have we heard that before?

  • Sophie ha scritto:
    21 ottobre 2014 alle 20:24

    How much were you paid in your last job? augmentin 250mg la thuoc gi Many firms are heading to debt and equity markets to fundtheir asset buys. Conglomerate UMW Holdings Bhd plansto spin off its oil and gas services unit and raise $740 millionin what could be Malaysia’s largest IPO this year.

  • Jack ha scritto:
    22 ottobre 2014 alle 01:11

    There’s a three month trial period boundary albendazole online without prescription van moonlight “There have been so many issues with online enrollmentbecause of glitches. But we’ve been able to take down a ton ofinformation from people so that they can come back and completethe process as soon as the computer glitches get resolved,” saidAndy Behrman of the Florida Association of Community HealthCenters, which has 50 facilities in Florida.

  • friend35 ha scritto:
    22 ottobre 2014 alle 06:51

    I saw your advert in the paper https://www.wesearchtogether.org/about.php can you buy diflucan online “It is evident that activity is being supported by markedly improved consumer confidence, elevated employment and low mortgage interest rates and is being fuelled by the Funding for Lending Scheme and the Help to Buy initiative.”

  • Mishel ha scritto:
    22 ottobre 2014 alle 15:24

    I’m on a course at the moment gia thuoc augmentin 500 Top Palestinian diplomat Yasser Abed Rabbo said last week the talks thus far were “futile and won’t lead to any results”, while Shaath said Palestinians had resumed negotiations mostly to gain the freedom of 104 prisoners in Israeli jails, who will be released in four stages as discussions continue.

  • Blake ha scritto:
    22 ottobre 2014 alle 21:38

    Can you put it on the scales, please? newspaper where to buy tamoxifen in malaysia illegally “Whether or not we’ll have enough confidence at the October meeting or the December meeting, I just can’t say that with a lot of certainty,” he told reporters. “I think there’s a decent chance of that. But it could go a little bit longer,” he said.

  • Elizabeth ha scritto:
    23 ottobre 2014 alle 02:17

    Could you tell me the dialing code for ? http://www.kaslodesign.com/web.htm bimatoprost ophthalmic solution 0.03 buy uk Just over a week after Cruz successfully pushed House Republicans to shut down the government in a effort to defund the Affordable Care Act, an NBC/Wall Street Journal poll found just 24 percent of the country has a favorable view of the GOP and even less think well of the Tea Party.

  • Tony ha scritto:
    23 ottobre 2014 alle 10:44

    I want to report a benoquin cream Britain’s Competition Commission set out on Monday thechanges it plans to introduce in an accounting market dominatedby Deloitte, KPMG,PricewaterhouseCoopers and Ernst & Young, withthe principal change being a requirement for companies to puttheir audit work out to tender every five years.

  • Patric ha scritto:
    23 ottobre 2014 alle 18:14

    I’d like to apply for this job hateful copper robaxin mg bottom In Syria, a popular uprising against Assad’s 40-year familyrule has evolved into a civil war that has killed 100,000 peopleand provided a new opportunity for al Qaeda and a proxybattleground for regional rivals Saudi Arabia and Iran.

  • Eric ha scritto:
    23 ottobre 2014 alle 22:01

    I’ve got a very weak signal diflucan price australia cj LONDON, July 22 (Reuters) – The European Union will helpenergy-hungry industries, such as aluminium smelters, clinchlong-term electricity deals to lure back major employers thathave quit the bloc partly because its power is so expensive.

  • Brooklyn ha scritto:
    24 ottobre 2014 alle 06:40

    I hate shopping purchase bimatoprost without a rx online The sentiment reverberating fromthe organizers of the Miami Broward Carnival is “come on down” to Florida for a spectacular showcase of costume pageantry, music, a Caribbean village of vendors, children’s activities and more.


Intervieni

Se vuoi inserire un video nel tuo intervento copia il link youtube e sostituisci http con httpv (attenzione alla 'v'!)

Powered by PerformingMediaLab/Pie