What are the after effects of Iceland volcano emissions ?
Volcanoes produce tiny particles - aerosols - which have a net cooling effect on the world because they reflect solar energy back into space. They also produce carbon dioxide, a greenhouse gas. Historically, the cooling has outweighed the warming. The 1991 eruption of Mount Pinatubo in The Philippines lowered global temperatures by about 0.4-0.5C - but Eyjafjallajokull, dramatic as it looks, is simply not in that league.
"Icelandic scientists have made a first estimate of the volume of material ejected, and it's about 140 million cubic metres," says Mike Burton from Italy's National Institute of Geophysics and Vulcanology.