http://opr.ca.gov/facts/
“Global temperatures have been high in the past. The current temperature increase is nothing new or unique, but just natural variation.”
The
world’s average temperature has varied naturally throughout the earth’s
history, and has been higher at times than today. However, the rate at
which greenhouse gases and temperatures are increasing is unique, and
points to human factors. Increases in global CO2 concentrations and
temperature that occurred over thousands of years in the past are now
happening in decades. As the IPCC points out, “there is no evidence that
this rate of possible future global change [upper end projections of
5°C (41°F) by the end of the century] was matched by any comparable
global temperature increase of the last 50 million years.” Furthermore,
climate models that only take natural processes into account cannot
reproduce the level of warming the planet has experienced over the past
century. When they factor in human activities, however, the models
accurately match the level of observed warming.
(IPCC 4th Assessment Working Group I, FAQs 6.2 and 9.2 . The Royal Society’s Climate change: a summary of the science .)
Para
quem quiser insistir na negação da autoridade científica do Painel
Intergovernamental para as Alterações Climáticas o IPCC (através da
conhecida estratégia de argumentação: "se não puderes negar os factos,
nega a autoridade das fontes desses factos") então, analisem-se os
seguintes estudos das mais variadas fontes.
NewYorkTimes:
Drexel University:
Greenpeace:
BBC News: (observem o gráfico)
The Financial Times:
Cito: "Among the 2,000
or so scientists at the Living Planet Symposium in Edinburgh, I
couldn’t find a single one who doubted either that climate change was
occurring or that it was significantly influenced by human actions. I did not encounter any “climate sceptics” there, [...]".
"There
were some very mild winters in Britain in the 1990s and early 2000s,
and then unexpectedly cold winters in 2009-10, 2010-11 and 2012-13.
Certain media organisations that should have known better jumped on
these variations as proof
that global warming was a myth perpetrated by a mass conspiracy of
scientists (surely the most remarkable conspiracy in history, and the
only one backed by a crushing majority of peer-reviewed scientific
papers).
This biased reporting had effects: the UK Energy Research Centre
recently reported that the proportion of people who do not believe
climate change is occurring has more than quadrupled since 2005 – from 4
per cent to 19 per cent[...]".
Finacial Post:
Office and Planning of Research - Caifornia
(quem paga e quem são os que negam?)
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