Proof for global warming that its not a natural occurrence?

Question

k clearly i think global warming is not a natural occerence. but can u guys give me proof that its not. And also find me some graphs.

Answer 1

I personally believe that global warming is a natural occourance

some belive it's not natural or that human activity is speeding the process up

We are currentally in an interglacial period, a time inbetween glacial periods when the global climate is warmer but still has at least one polar ice cap.

If you look at graphs, an interglacial period lasts for about 15,000 years, and it has been 10,000 years since the global climate has started to warm (I'm sorry that I don't have any direct links, but go to google.com, and do a search for global climate in the past 50,000 years) The trend looks normal

hope I helped :-)

Answer 2

Al Gores AN INCONVINIENT TRUTH!

Answer 3

CANT U SEEE!!!!!? (people) THAT THE EARTH IS GETTING HOTTER AND HOTTER AND THE SOUTH AND THE NORTH POLE ARE MELTING!!!! (why do people still say that global warming is true not even though the north pole is melting and the south pole is melting and 2005 was the hottest year of all and and and.....!!!!!) PEOPLE WHO DOSEN'T BELIVE IN GLOBAL WARMING ARE WEIRD I TELL YA W-E-I-RRRRR-DDDDDDDDD!!!!!!!!!!!!!

Answer 4

Leonardo DiCaprio's The 11th Hour

Answer 5

I don't have any kind of graph, but if you believe our planet has had an ice age in the past, such as when the woolly mammoth roamed the earth, then history can show that global warming can be a natural occurrence, I'm not saying the warming we are going through today has nothing at all to do with man, but the Earth did warm without our input when the last ice age came to an end.

Answer 6

There are many basic scientific facts which can only be explained if the current global warming is being caused by an increased greenhouse effect due to carbon dioxide accumulating in the atmosphere from humans burning fossil fuels.

For example, the planet is warming as much or more during the night than day.  If the warming were due to the Sun, the planet should warm a lot more during the day when the Sun has influence.  Greenhouse gases trap heat all the time, so they warm the planet regardless of time of day.  Another example is that the upper atmosphere is cooling because the greenhouse gases trap the heat in the lower atmosphere.  If warming were due to the Sun, it would be warming all layers of the atmosphere.

http://answers.yahoo.com/question/index;...

We know it's warming, and we've measured how much:

http://www.epa.gov/climatechange/science...

Scientists have a good idea how the Sun and the Earth's natural cycles and volcanoes and all those natural effects change the global climate, so they've gone back and checked to see if they could be responsible for the current global warming.  What they found is:

Over the past 30 years, all solar effects on the global climate have been in the direction of (slight) cooling, not warming.  This is during a very rapid period of global warming.

http://news.bbc.co.uk/2/hi/uk_news/62902...

http://www.pubs.royalsoc.ac.uk/media/pro...

A recent study concluded:

“the range of  [Northern Hemisphere]-temperature reconstructions and natural forcing histories…constrain the natural contribution to 20th century warming to be <0.2°C [less than one-third of the total warming].  Anthropogenic forcing must account for the difference between a small natural temperature signal and the observed warming in the late 20th century.”

http://www.pnas.org/cgi/content/full/104...

You can see this in the third graph here, where the dotted lines are just from natural causes, and the full lines are natural + human causes:

http://www.pnas.org/content/vol104/issue...

If that’s not enough to convince you the Sun isn’t responsible, consider the fact that no scientific study has ever attributed more than one-third of the warming over the past 30 years to the Sun, and most attribute just 0-10% to the Sun.

http://answers.yahoo.com/question/index;...

So the Sun certainly isn't a large factor in the current warming.  They've also looked at natural cycles, and found that we should be in the middle of a cooling period right now.

"An often-cited 1980 study by Imbrie and Imbrie determined that 'Ignoring anthropogenic and other possible sources of variation acting at frequencies higher than one cycle per 19,000 years, this model predicts that the long-term cooling trend which began some 6,000 years ago will continue for the next 23,000 years.'"

http://en.wikipedia.org/wiki/Milankovitc...

http://www.sciencemag.org/cgi/content/ab...

So it's definitely not the Earth's natural cycles.  They looked at volcanoes, and found that

a) volcanoes cause more global cooling than warming, because the particles they emit block sunlight

b) humans emit over 150 times more CO2 than volcanoes annually

http://volcano.und.edu/vwdocs/Gases/man....

So it's certainly not due to volcanoes.  Then they looked at human greenhouse gas emissions.  We know how much atmospheric CO2 concentrations have increased over the past 50 years:

http://en.wikipedia.org/wiki/Image:Mauna...

And we know from isotope ratios that this increase is due entirely to human emissions from burning fossil fuels.  We know how much of a greenhouse effect these gases like carbon dioxide have, and the increase we've seen is enough to have caused almost all of the warming we've seen over the past 30 years (about 80-90%).  You can see a model of the various factors over the past century here:

http://en.wikipedia.org/wiki/Image:Clima...

This is enough evidence to convince almost all climate scientists that humans are the primary cause of the current global warming.

Answer 7

the fact that sea levels are rising and low-level, third world countries are already suffering

Answer 8

This explanation may be somewhat softened since it comes from the Bush administration's U.S. Global Change Research Information Office, but it's still pretty clear:

Can the Warming of the 20th Century be Explained by Natural Variability?

http://www.gcrio.org/ipcc/ar4/wg1/faq/ar...

"It is very unlikely that the 20th-century warming can be explained by natural causes. The late 20th century has been unusually warm. Palaeoclimatic reconstructions show that the second half of the 20th century was likely the warmest 50-year period in the Northern Hemisphere in the last 1300 years. This rapid warming is consistent with the scientific understanding of how the climate should respond to a rapid increase in greenhouse gases like that which has occurred over the past century, and the warming is inconsistent with the scientific understanding of how the climate should respond to natural external factors such as variability in solar output and volcanic activity. Climate models provide a suitable tool to study the various influences on the Earth’s climate. When the effects of increasing levels of greenhouse gases are included in the models, as well as natural external factors, the models produce good simulations of the warming that has occurred over the past century. The models fail to reproduce the observed warming when run using only natural factors. When human factors are included, the models also simulate a geographic pattern of temperature change around the globe similar to that which has occurred in recent decades. This spatial pattern, which has features such as a greater warming at high northern latitudes, differs from the most important patterns of natural climate variability that are associated with internal climate processes, such as El Niño."

How do Human Activities Contribute to Climate Change and How do They Compare with Natural Influences?

http://www.gcrio.org/ipcc/ar4/wg1/faq/ar...

"Human activities contribute to climate change by causing changes in Earth’s atmosphere in the amounts of greenhouse gases, aerosols (small particles), and cloudiness. The largest known contribution comes from the burning of fossil fuels, which releases carbon dioxide gas to the atmosphere. Greenhouse gases and aerosols affect climate by altering incoming solar radiation and out-

going infrared (thermal) radiation that are part of Earth’s energy balance. Changing the atmospheric abundance or properties of these gases and particles can lead to a warming or cooling of the climate system. Since the start of the industrial era (about 1750), the overall effect of human activities on climate has been a warming influence. The human impact on climate during this era greatly exceeds that due to known changes in natural processes, such as solar changes and volcanic eruptions."

There's far more detail at the links of course.

For a wide variety of relevant graphs:

http://www.columbia.edu/~jeh1/2008/illwe...

Answer 9

I refer you to former Vice President Al Gore's Film "An Inconvenient Truth". In the film, he showed graphs of Carbon Dioxide levels rising over the years, as more and more of the gas entered the atmosphere. Carbon Dioxide has the ability to warm the atmosphere, and thus, it is the primary cause of Global Warming. I believe that the best course of action for you, if you want proof, is to watch "An Inconvenient Truth". The evidence in the film is not some sort of propaganda, it is scientific proof from someone who is truly an environmentalist and who truly understands science.

Answer 10

That Al Gore Movie was only made so Al could get back in the spot light. I think it is natural.