Umberto Crescenti, i cambiamenti climatici e gli altri due milioni

Nel 2010, il 97% degli scienziati del clima : i cambiamenti climatici sono con grande probabilita' collegati alle attivita' umane.  

Dal sito web della NASA

W. R. L. Anderegg, “Expert Credibility in Climate Change,” 

Proceedings of the National Academy of Sciences 107 12107-12109 (2010)

In quel 3% di negazionisti c'e' Umberto Crescenti,

dell'Universita' di Chieti, 

 i cui convegni li ricordo bene.


The scientific opinion on climate change is that the Earth's climate system is unequivocally warming, and it is extremely likely (at least 95% probability) that humans are causing most of it through activities that increase concentrations of greenhouse gases in the atmosphere, such as deforestation and burning fossil fuels.

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Il protocollo di Kyoto vuole frenare la crescita economica mondiale
per ridurre le emissioni di anidride carbonica in
atmosfera causate dalle attivita' dell'uomo.


Esso si fonda sull’asserzione che nella comunità scientifica esista
un consenso pressocchè unanime sull’origine
e sui pericoli posti dal cambiamento del clima.
Tale asserzione non corrisponde al vero.

La scienza del clima è ancora nella sua infanzia ed
i fattori che governano il clima globale sono molteplici,
non pienamente conosciuti e principalmente naturali.

La nostra capacità di influenzare tali fattori rimane molto limitata.

La storia del clima sulla Terra è caratterizzata da un susseguirsi
di cambiamenti climatici, avvenuti ben prima che
l’uomo sviluppasse attività industriali.

Il riscaldamento del pianeta, iniziato da alcuni secoli
 ha prodotto numerosi effetti positivi. 

L’umanità può goderne adattandosi ad essi, mentre l’illusione
di fermarli potrebbe travolgere le economie più deboli,
minacciando la sopravvivenza di miliardi di esseri umani.

Umberto Crescenti e Luigi Mariani
"Cambiamenti climatici e conoscenza scientifica"
 in vendita a 10 euro


Umberto Crescenti

Professore ordinario di geologia applicata Università G. d'Annunzio di Chieti
 Rettore della Università G. d'Annunzio dal 1985 al 1997
 Presidente della Società Geologica Italiana da 1999 al 2005
Fondatore e Presidente della Associazione Italiana di Geologia Applicata e
Ambientale dal 1999 al 2005
Fondatore e Presidente nel 2001 della Associazione Italiana Geologia e Turismo
Autore di oltre 100 pubblicazioni su riviste scientifiche sia italiane sia straniere 

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Ecco invece cosa dicono vari enti, diciamo con un po piu di peso di Umberto Crescenti, alcuni da oltre dieci anni. Notare l'urgenza della necessita' di fermare il tutto.

American Association for the Advancement of Science

The scientific evidence is clear: global climate change caused by human activities
 is occurring now, and it is a growing threat to society
(2006)

American Chemical Society

Comprehensive scientific assessments of our current and potential future climates
clearly indicate that climate change is real,
largely attributable to emissions from human activities,
and potentially a very serious problem (2004)

American Geophysical Union

Human‐induced climate change requires urgent action.
Humanity is the major influence on the global climate
 change observed over the past 50 years.  (2003)

American Medical Association

AMA supports the findings of the Intergovernmental Panel on
Climate Change’s fourth assessment report and concurs
with the scientific consensus that the Earth is
undergoing adverse global climate change and that
anthropogenic contributions are significant
(2013)

American Meteorological Society

It is clear from extensive scientific evidence that the dominant cause of
the rapid change in climate of the past half century
is human-induced increases in the amount of atmospheric
greenhouse gases, including carbon dioxide (CO2),
chlorofluorocarbons, methane, and nitrous oxide. (2012)

American Physical Society

 The evidence is incontrovertible: Global warming is occurring. 

If no mitigating actions are taken, significant disruptions in the Earth’s 

physical and ecological systems, social systems, security and human health are likely to occur. 

We must reduce emissions of greenhouse gases beginning now. (2007)

The Geological Society of America

The Geological Society of America concurs with assessments
 by the National Academies of Science (2005),
 the National Research Council (2006),
and the Intergovernmental Panel on Climate Change (IPCC, 2007)
that global climate has warmed and that human activities
(mainly greenhouse‐gas emissions) account for most
of the warming since the middle 1900s.
(2006)

International academies

"Climate change is real. There will always be uncertainty in understanding a system as complex as the world’s climate. However there is now strong evidence that significant global warming is occurring. The evidence comes from direct measurements of rising surface air temperatures and subsurface ocean temperatures and from phenomena such as increases in average global sea levels, retreating glaciers, and changes to many physical and biological systems. It is likely that most of the warming in recent decades can be attributed to human activities (IPCC 2001)
(2005)

Firmato dai presidenti delle accademie di scienza di

Francia
Italia
UK
Germania
Giappone
USA
Russia
Cina
India
Canada

U.S. National Academy of Sciences

The scientific understanding of climate change is now sufficiently clear to justify taking steps to reduce the amount of greenhouse gases in the atmosphere. (2005)

U.S. Global Change Research Program

The global warming of the past 50 years is due primarily to human-induced increases in heat-trapping gases. Human 'fingerprints' also have been identified in many other aspects of the climate system, including changes in ocean heat content, precipitation, atmospheric moisture, and Arctic sea ice

(2009, 13 U.S. government departments and agencies)

Intergovernmental Panel on Climate Change

Warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice, and rising global average sea level.

Most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations

 IPCC defines ‘very likely’ as greater than 90 percent probability of occurrence.

Statement on climate change from 18 scientific associations (2009)

AAAS Board Statement on Climate Change (2006)

ACS Public Policy Statement: Climate Change (2010-2013)

Human‐Induced Climate Change Requires Urgent Action (2013)

 Global Climate Change and Human Health (2013)

Climate Change: An Information Statement of the American Meteorological Society (2012)

APS National Policy 07.1 Climate Change (2007) 

 GSA Position Statement on Climate Change (2010) 

Joint science academies' statement: Global response to climate change (2005)  

Understanding and Responding to Climate Change (2005) 

Global Climate Change Impacts in the United States (2009) 

IPCC Fourth Assessment Report, Summary for Policymakers (2007)

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