Since these chemicals would have been spread around the globe before they settled into the ice, many other glaciers are probably contaminated too. (newscientist.com)
The concept then spread around the globe in cities including London and Washington. (scientificamerican.com)
The 1991 eruption of Mount Pinatubo in the Philippines, for example, ejected at least five cubic kilometres of ash and gas which rapidly spread around the globe, decreasing the average global temperature by 0.5 C. (bbc.com)