The sea probably emits more gas in one day, than we did in the last 1000 years! Think about, volcanoes errupting so furiously they blocked out the sun for a few years. Now thats pollution! In the course of geologic time we are not even a blink. We have some impact but it is negligble in the scheme of things. I don't know if I'm the new age sucker or the people that get fed their propaganda.
That is an interesting argument, were it not for the fact that those other phenomenon are natural and have been happening for the length of earth’s history. And over all are balanced out by other mechanism in nature making this plant’s climate rather stable over long periods of time. So the question now is,
1. Do we have tangible evidence that sea water is evaporating more than it had in the past?
2. And do we have tangible evidence that volcanic activity has increased over the last 100 year? (I think dubs would love you if you could prove this second one)
The truth is volcanoes tend to erupt ash high into the Stratosphere that hence act as blocking mechanism for Sun’s short-wave radiation, rather than the other way around. Hence, you often have cooler years after a major eruption. Take for example Santorini eruption (cc 1630 BCE) was followed by a short period of summer cooling that then affected crops. We know that by the tree rings from that period being unusually thin. Note by the same token during the winter the ash in stratosphere acted as a shield so usually that meant milder winters, since long-wave radiation could not escape into space that easily.
The same pattern you could observe in eruptions closer to our time like 1991 Pinatubo eruption.
So if none of these and other natural phenomenon can satisfactorily explain global rise in temperature then you have to search for what is else happening. And no I completely disagree that this is now part of political campaign or any other propaganda. Scientists have been pointing to the fact that carbon is warming our climate for quite some time, it is only that public is waking up to the fact NOW.
Way back in 1896 Swedish physicist, Svante Arrhenius warned us that increase of Carbon can in fact increase global temperatures.
In 1930’s Guy Callendar a British researcher monitoring temperature data from various parts of the world noticed that over time temperatures were going up. After that a number of other people noticed that not everything was so care-free. So no this is not something someone concocted to increase his business turnover.
Of course, people will try to make a buck out of everything; in fact one of the ways to stop global warming is to encourage businesses to look at environment friendly alternatives. Up until recently very few of them paid much of attention. It was only when public finally became aware what was indeed going on that “climate” shifted (no pun intended) and of course now businesses are scrabbling for their position, because of estimated “green” dollar being worth several trillion dollars. That of course does not nullify the fact that climate is changing rapidly, it only testify to the extent of human need to make money no matter what is going on.