SO4 päästöt

"Ihmiskunnan toiminta muuttaa planeettamme ilmakehän koostumusta. Kasvihuonekaasujen, kuten hiilidioksidin, pitoisuus ilmakehässä on nousussa. Kasvihuonekaasujen lisääntyminen näkyy jo ilmastossa."
http://www.fmi.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://www.fmi.fi/kysymyksia/index_11.html#6

"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/