Lähdekritiikki

"Ihmiskunnan toiminta muuttaa planeettamme ilmakehän koostumusta. Kasvihuonekaasujen, kuten hiilidioksidin, pitoisuus ilmakehässä on nousussa. Kasvihuonekaasujen lisääntyminen näkyy jo ilmastossa."
http://ilmatieteenlaitos.fi/ilmastonmuutos/

"Maapallon keskilämpötila on noussut 1900-luvun alusta lukien 0.6-0.9 asteella. 1900-luvun alkupuolen lämpeneminen lienee vielä suureksi osaksi luonnollisten tekijöitten aikaansaamaa, mutta vuoden 1970 tienoilla alkanut uusi nopea lämpeneminen johtuu valtaosin ihmiskunnan päästöistä."
http://ilmatieteenlaitos.fi/ilmastonmuutoskysymyksia#9

"IAC totesi, että IPCC on onnistunut tehtävässään hyvin, ja 2007 ilmestyneen neljännen arviointiraportin johtopäätökset pitävät edelleenkin hyvin paikkansa. Keskeiset tulokset osoittivat, että ihmiskunnan päästöt ovat pääasiallinen syy käynnissä olevaan ilmastonmuutokseen, ja että ilmastonmuutos voi tuottaa merkittäviä riskejä ihmiskunnan hyvinvoinnille, jos kasvihuonekaasujen päästöjä ei kyetä rajoittamaan."
http://legacy.fmi.fi/uutiset/index.html?A=1&Id=1287054553.html

"A large body of evidence supports the conclusion that human activity is the primary driver of recent warming. This evidence has accumulated over several decades, and from hundreds of studies. The first line of evidence is our basic physical understanding of how greenhouse gases trap heat, how the climate system responds to increases in greenhouse gases, and how other human and natural factors influence climate."
http://www.ncdc.noaa.gov/faqs/climfaq15.html
http://www.ncdc.noaa.gov/indicators/

"Most scientists agree the main cause of the current global warming trend is human expansion of the "greenhouse effect" -- warming that results when the atmosphere traps heat radiating from Earth toward space. ... Humans have increased atmospheric CO2 concentration by a third since the Industrial Revolution began. This is the most important long-lived "forcing" of climate change."
http://climate.nasa.gov/causes/

"Climate model simulations that consider only natural solar variability and volcanic aerosols since 1750—omitting observed increases in greenhouse gases—are able to fit the observations of global temperatures only up until about 1950. After that point, the decadal trend in global surface warming cannot be explained without including the contribution of the greenhouse gases added by humans."
http://earthobservatory.nasa.gov/Features/GlobalWarming/page4.php

"Increased concentrations of greenhouse gases in the atmosphere due to human activities are most likely the underlying cause of warming in the 20th century."
http://www.cru.uea.ac.uk/cru/info/warming/

"There is strong evidence that changes in greenhouse gas concentrations due to human activity are the dominant cause of the global warming that has taken place over the last half century."
http://royalsociety.org/climate-change-summary-of-science/
PDF: http://royalsociety.org/WorkArea/DownloadAsset.aspx?id=4294972963

"Emissions of greenhouse gases from human activities are changing the atmosphere in ways that affect the Earth's climate. Greenhouse gases include carbon dioxide as well as methane, nitrous oxide and other gases. They are emitted from fossil fuel combustion and a range of industrial and agricultural processes. ... 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."
http://www.aps.org/policy/statements/07_1.cfm

"Ahead of the latest UN talks on climate change in Mexico, the Met Office analyses long- and short-term trends in climate and reveals that the evidence for man-made warming has grown even stronger in the last year."
http://www.metoffice.gov.uk/corporate/pressoffice/2010/pr20101126b.html

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