What are the main two causes of global warming?

Question

co2, greenhouse,...etc. but what the main two ?

Answer 1

The Sun and weakening of the Earths magnetic fields.

Answer 2

Come on...I'm really getting tired of this crap about global warming. I think the environment is VERY important, and no matter what ,should be treasured and treated as such. I mean even if global warming is determined not to be caused by humans, we still need to take care of our environment, I don't think many people would disagree. Ok, with that said, I think that the bottomline on global warming is that there is no bottomline. The only thing that has been scientifically proven is that the earth has warmed .9 degrees in the past century. The source of this warming (which I'm sure by the way is going to be multifaceted) has not been proven conclusively.

I think it is important to look at this debate from a new angle considering we can argue the "scientific facts" all day and get nowhere because scientists don't agree (and please don't tell me that all scientists do agree it is human caused because there is a list of over two thousand PhD. climatologists, earth scientists, and meteorologists who have signed petitions saying the evidence does not exist). I mean think about it....humans are being extremely vain with the thought process that we have caused GW. The earth is approx. 5 billion years old and therefore the age of man has been a very short time period in the earth' existence. To break it down even more, the time period man has released significant amounts of CO2 in the atmosphere is just a moment in time for the earth. People must also realize that the atmosphere is not exactly fragile and it is ever changing (humans or not). To say that we humans have caused a potentially deadly, drastic, and irreversible change in the climate is as rediculous as saying something like "eating one cookie is going to make you gain 100 pounds." Stupid analogy, I know, but it was the first thing that came to mind. The point is that Humans are very ego driven. In our minds everything we do has purpose, whether good or bad, and affects everyone around us. "The earth revolves around me" on a larger scale. The egos combined with the idea that we know everything drives the theory of human created GW. I think it is great that we are starting to become more environmentally aware, however we should have always been like this, not just when we are threatened.
Anyway, we humans have a problem dealing with the fact that we may not have all the information we need to make informed decisions. And in this case, we don't have all the info, and we are jumping to conclusions because we think we are so smart. The only thing I suggest is that we continue to protect and help the environment, wait for the evidence before we make ourselves look like fools on either side of the debate, and for God's sake stop telling people they are idiots for believing/not believing in man-made GW. I mean come on, you only make yourselves look like idiots because any informed person knows that there is evidence on boths sides. Which means: Man-made GW theory is INCONCLUSIVE

Answer 3

Why are you only asking about two? Several factors have been put forward.

The majority view is recent warming is mainly attributable to man-made atmospheric CO2.

Roger A Pielke thinks man is responsible for most of the warming but does not think CO2 is the main issue. He believes land use/land cover changes change climate more.
http://climatesci.colorado.edu/2007/09/02/summary-conclusions-of-climate-science/

Another view is that the warming is partially due to solar variation. The direct changes in solar variation are not great. The IPCC estimates direct contribution at 1.3 W/M2. But some scientists have hypothesized that mechanisms in the climate create "solar amplification" meaning there is both a direct and indirect contribution from solar.
http://en.wikipedia.org/wiki/Solar_variation
http://cc.oulu.fi/~usoskin/personal/Sola2-PRL_published.pdf
http://www.gsajournals.org/perlserv/?request=get-static&name=i1052-5173-14-3-e4&ct=1

Another view is that cosmic rays play a big role. This view is championed by Hendrik Svensmark of the Danish National Space Center and Nir Shaviv.
http://royalsociety.metapress.com/content/3163g817166673g7/
http://adsabs.harvard.edu/abs/2006cosp...36.1103S

My favorite view is that the recent warming is mainly a result of internal climate variation due to oceanic oscillations being in the warm phase. This most important of these is the Pacific Decadal Oscillation (PDO). It was in a warm phase from 1905 to 1945 and global temps went up. It was in a cool phase from 1946 to 1975 and temps went down. It was in a warm phase from 1976 to 2006 and temps went up. The PDO just changed to the cool phase so I expect cooler temperatures in the years ahead. Other oceanic oscillations include the North Atlantic Oscillation (NAO) and the El Nino Southern Oscillation (ENSO). The greatest impact happens when all three are in a warm phase at the same time, as in 1998 and 2006.
http://en.wikipedia.org/wiki/Pacific_decadal_oscillation
http://www.agu.org/pubs/crossref/2007/2007GL030288.shtml

Out of these different causes, I think the most important is the internal natural variation at the ocean atmosphere interface (mainly the PDO), with land use/land cover changes second and manmade CO2 third.

Answer 4

linlyons is right, devoid of worldwide warming of approximately 33 ranges celsius, we would be on a frozen ball of ice. maximum of that warming comes from water vapor that interacts with warmth it somewhat is re-emitted via the Earth, different greenhouse gases (GHG) make up the soundness, with CO2 inflicting an volume it somewhat is extremely confusing to pin down. between 9% and 26%, you will think of we would be waiting to be extra precise than this. yet devoid of radiation first coming to us from the sunlight there'd be no longer something to dam so the two considerable motives are photograph voltaic radiation (no longer purely seen photograph voltaic) and water vapor. Oddly adequate, at modern-day ranges (.04% of our ecosystem), CO2 provides approximately 3C of the entire warming, however the IPCC thinks that including even somewhat extra will reason catastrophic warming of as much as 8C. on the present fee of enhance we can't double the quantity of CO2 till 2250 or so, yet even a small enhance could reason quite much triple the warming of the 1st 381 areas according to million? it somewhat is a wierd fable yet no longer a variety of of a concept and extra scientists are determining directly to make a stand against the alarmists each and each month. sometime we will all see this for the capability grab the UN that it somewhat is yet till then have not got faith each and every little thing you study or pay attention approximately worldwide warming. satellite tv for pc documents from NASA shows it somewhat is been cooling on the grounds that 2003, on the linked fee of three.6 C according to century, a extra robust fee than the warming that brought about this hysteria. however the guidelines from floor stations interestingly shows much less cooling, permitting some to declare there is little or no cooling. That documents is actual and cleverly manipulated however the satellite tv for pc documents is impartial as much as now and shows cooling that could desire to venture any rational guy or woman.

Answer 5

Carbon dioxide and other air pollution that is collecting in the atmosphere like a thickening blanket, trapping the sun's heat and causing the planet to warm up.

Answer 6

1. the process by which the human species recovers Carbon that was buried form millions of years, by mining or drilling, burn it and converts it to CO2 gas in the atmosphere, we call it fossil fuels consumption.
2. The process by which the human species reduces the mass of flora worldwide, in order to produce more food and shelter to the growing number of humans, and the desire of every human to have more and better food, and better shelters, we call this process deforestation.

Answer 7

the earths natural cycle the earth used to be tropical until the ice age they cant get any scientist to agree on global warming being caused by us

Answer 8

I would say co2 and the loss of forests worldwide, but its still up for speculation

Answer 9

increased emissions co 2 + natural global warming phase + sun cycle + weakening of earths magnetic fields ,etc.

Answer 10

God and Jesus...also the Holy Spirit