Per Oren:
Now. Will somebody give a me a link to any study (a single one) that
sates climate change is caused by man?

How about http://climate.nasa.gov/scientific-consensus?

More like a comprehendum of positions that a "study" per se... but I'd
have to think that it represents the views of many people with expertise
who have read studies that lead them to their positions.

Some quotes from that web page:
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"Ninety-seven percent of climate scientists agree that climate-warming
trends over the past century are very likely due to human
activities,1and most of the leading scientific organizations worldwide
have issued public statements endorsing this position. The following is
a partial list of these organizations....

AMERICAN SCIENTIFIC SOCIETIES

- 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)3

- 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)4

- 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. Rapid societal responses can significantly lessen
negative outcomes." (Adopted 2003, revised and reaffirmed 2007, 2012,
2013)5

- American Medical Association
"Our 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)6

- 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)7

- 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)8

- The Geological Society of America
"The Geological Society of America (GSA) 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; revised 2010)9


SCIENCE ACADEMIES

- International academies: Joint statement
"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, 11 international science
academies)10

- 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)11


U.S. GOVERNMENT AGENCIES

- 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)12


INTERGOVERNMENTAL BODIES

- 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.”13

“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.”14

*IPCC defines ‘very likely’ as greater than 90 percent probability of
occurrence."
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--
Pete Cresswell