How does anthropogenic particle emission compare with natural sources, for example volcanoes, deserts, sea salt etc?
That is very difficult to say. Emissions from volcanoes can have a big global effect on the climate, but it is transitory – the Earth may go many decades between major eruptions. Sea salt and natural sulphur compounds emitted by plankton are also very important for cloud formation. But the results from the Indian Ocean Experiment suggest that the effects of anthropogenic particles in the atmosphere dominate natural effects, in the Indian Ocean at least. At the moment the scientific consensus is that global dimming is a man-made phenomenon. Another important aspect of man-made particle pollution is that the evidence is growing that its direct impact on human health is very serious – causing literally hundreds of thousands if not millions of deaths annually. Sea salt doesn’t give you cancer! If the 9/11 contrail evidence suggests warmer nights due to the air travel, isn’t that global warming rather than dimming? The 9/11 study showed that removing contrails resulted in a large increase i
That is very difficult to say. Emissions from volcanoes can have a big global effect on the climate, but it is transitory – the Earth may go many decades between major eruptions. Sea salt and natural sulphur compounds emitted by plankton are also very important for cloud formation. But the results from the Indian Ocean Experiment suggest that the effects of anthropogenic particles in the atmosphere dominate natural effects, in the Indian Ocean at least. At the moment the scientific consensus is that global dimming is a man-made phenomenon. Another important aspect of man-made particle pollution is that the evidence is growing that its direct impact on human health is very serious – causing literally hundreds of thousands if not millions of deaths annually. Sea salt doesn’t give you cancer! If the 9/11 contrail evidence suggests warmer nights due to the air travel, isn’t that global warming rather than dimming? The 9/11 study showed that removing contrails resulted in a large increase i
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