I have watched a film on Global warming. Is it real? The CO2 emissions have been greater 200 years ago, and people are saying we are polluting much more than before. There is only 2% of CO2 in the atmosphere, as I have learnt in a film. Greenland was used to be called greenland because it was all green, but now it is covered in ice.
Is it only a cycle?
As a physical science teacher I have been following the global warming debate for many years. I have almost daily discussions with like-minded people about it. I confess I am not 100% convinced it is real. What I am convinced of is that it would be a good thing for your average citizen to believe that anthropogenic global warming is real. This might conceivably lead to fewer wars being fought over oil supplies .
Global warming has been a hot topic, especially when people high up in the government start to explain why we are heading for disaster. Often times I hear people say how bad things are—that they were never like this before. However, I have heard other, older people, and have read articles, that state that whatever we notice on the weather front for which we blame global warming, these are cycles that are repeated every so often, as long as these things have been reported.
Do I believe that global warming is something that needs to be studied, but I don't know if people truly understand what is happening, and how much is something that is blown out of proportion to frighten people or earn money for more studies. It is hard to know what to believe, but regardless, I believe it is our responsibility to do all we can for the benefit our not just ourselves, but more for our children and their children.
As you have probably figured out after all these posts, there are many ways of looking at your questions and just as many answers.
Personally, I am convinced that the climate is changing and that human activity is speeding that change. I haven't done an in-depth study of worldwide weather cycles so I can't say if I think these human activities are intensifying the effects of cyclical changes that would have happened regardless of humanity. If, in fact, the climate is in a period of warming, then it becomes even more important for humanity to figure out and act upon steps to counteract the effects of that warming if we want to continue to live in anything close to the patterns of human cultures created to this point in time.
Global warming or climate change as #4 rightly puts it is something for which we are responsible to a large extent. There is a lot of debate going on whether the changes in the environment that we are seeing is due to cyclical processes that take place naturally. But the fact that humans have completely altered the environment is undoubtedly true. And we need to realize that steps to save the environment have to be taken immediately for our own survival if not for that of the planet.
While it is quite probably that the Earth is in a warming cycle, as the poster above has indicated, I believe it has little to do with human activity. Despite that, I think it is just good karma, or at the very least common sense, to reduce the amount of CO2 we are releasing into the atmosphere. While it may not be causing global warming, it is changing the nature of nature...and that is probably not a great thing.
Greenland was named "greenland" as a means to entice settlers to the ice-covered landmass in the 9th century.
No one will dispute that the climate is changing; the causes of change remain in contention, but the fact that the Earth's climate has altered substantially (warmer and colder) before humans ever existed suggests that the current climatic changes may have little or no basis in human activity. The fact is that the Earth has been on a warming trend for the past several hundred years, before mass industrialization. Perhaps that has exacerbated the trend, but has not created it.
The parts per million of CO2 in the atmosphere were not greater two hundred years ago than they are today. In fact, they have been steadily rising. Increases are due to increased burning of fossil fuels after the Industrial Revolution as well as cutting down forests. Trees help remove carbon dioxide from the atmosphere. However, although the climate has been warming in recent years, the Gaia hypothesis shows that the earth can regulate itself. Also, the earth goes through cyclical periods of warming and ice ages as seen in the fossil and geological records.
First of all the true term is "climate change" not "global warming." The effects of warmer temperatures over time causes more extremes in weather patterns including increases in ice and snow (the Greenland example you mentioned). There is evidence to show that the earth has been in an overall warming trend over the past century or so. The real question is if this warming is part of the planet's natural cycle or the result of human activity? That is the real heart of the argument.
I do not believe that carbon dioxide concentrations in the atmosphere were greater in past times than they are now. See, for example, this link:
It may be (though I doubt it) that there were more emissions back then, but the build up of emissions over time has clearly resulted in a higher concentration of CO2 in the atmosphere today.
In general, I believe that global warming is happening and that it is related to human activity. The evidence seems compelling on that point.
ok, now to prove global warming, now a days the temperature everywhere is rising at a crazy rate and it is only going up. this is due to global warming. and it can have alot of disasterous effects as well. one of the main effects will be rise of the sea level which may cause the end of the world (not joking).