the correct position is, it's real, and it's caused by burning fossil fuel.
Global warming is already a serious problem. Have you heard about Darfur?
300,000+ dead already. Many of them children. Because of global warming.
Warming in the Indian Ocean changed the rain patterns, so crops failed.
People had to move to survive - to get food and water. That's global warming.
http://www.theatlantic.com/doc/200704/darfur-climate/2
Historically, global warming, and cooling occur naturally.
Ice ages occur in about 100,000 year cycles.
Changes in the eccentricity of the earth's orbit are the driving factor.
When the orbit is very eccentric, an ice age occurs.
when the orbit is more circular, we have an inter-glacial.
that's what's happening now, and it will be a few thousand years before we can expect natural causes to drive the climate toward a new ice age.
http://en.wikipedia.org/wiki/Milankovitch_cycles
Here's the bigger version of the graph.
Note how ice age cycles line up with eccentricity cycles.
http://en.wikipedia.org/wiki/File:Milankovitch_Variations.png
all the honest science organizations think it's both real, and a serious problem.
NASA - http://apod.nasa.gov/apod/ap090421.html
NSF - http://www.nsf.gov/news/news_summ.jsp?cntn_id=114961
NOAA - http://www.ncdc.noaa.gov/paleo/globalwarming/what.html
MIT - http://web.mit.edu/newsoffice/2009/roulette-0519.html
UCLA - http://newsroom.ucla.edu/portal/ucla/globa-warming-affects-warm-weather-68463.aspx
http://dels.nas.edu/dels/rpt_briefs/climate_change_2008_final.pdf <== here's the science.
http://www.rkm.com.au/ANIMATIONS/carbon-dioxide-global-warming.html <== here's the physics.
http://www.school-for-champions.com/science/infrared_greenhouse_effect.htm <== melting of the Siberian tundra is a global warming time bomb.
http://fora.tv/2009/08/18/A_REALLY_Inconvenient_Truth_Dan_Miller <== This is an hour long, but is very good.
you'll see several posts that claim it's not real.
i wonder who to believe?
how 'bout climatologists, meteorologists, and all the major science organizations?
http://www2.sunysuffolk.edu/mandias/global_warming/is_global_warming_hype.html
<<A poll ... of 3,146 Earth scientists showed 96.2% of climatologists who are active in climate research believe that mean global temperatures have risen compared to pre-1800s levels, and 97.4% believe that human activity is a significant factor in changing mean global temperatures. >>
97% of climatologists think that there's a problem, and we're causing it.
http://www.ametsoc.org/policy/2009geoengineeringclimate_amsstatement.html
<<Human responsibility for most of the well-documented increase in global average temperatures over the last half century is well established. Further greenhouse gas emissions, particularly of carbon dioxide from the burning of fossil fuels, will almost certainly contribute to additional widespread climate changes that can be expected to cause major negative consequences for most nations .... impacts are expected to include further global warming, continued sea level rise, greater rainfall intensity, more serious and pervasive droughts, enhanced heat stress episodes, ocean acidification, and the disruption of many biological systems. These impacts will likely lead to the inundation of coastal areas, severe weather, and the loss of ecosystem services, among other major negative consequences.>>
http://en.wikipedia.org/wiki/Scientific_opinion_on_climate_change#Statements_by_dissenting_organizations
<<With the release of the revised statement by the American Association of Petroleum Geologists in 2007, no remaining scientific body of national or international standing is known to reject the basic findings of human influence on recent climate change.>>
ie, no reputable scientific organization claims that AGW is not real.
in addition, it is worthy of note that the last group to admit the problem was the American Association of Petroleum Geologists.
that should give you a telling clue.
Last, when you compare, you might note that i've posted honest links from folks that do real science.
NASA, NOAA, NSF, MIT, and UCLA.
if any of those that claim it's not real post links, you might think about who you should trust.