Climate change has received considerable media attention in recent years, particularly in terms of the enhanced greenhouse effect and predicted global warming. This paper examines the alternative impact of atmospheric acrosols on global climate in terms of the so-called dust-veil effect, which is associated with global cooling. This volcanic signal is assessed through the application of dust-rating and explosivity indices, and their limitations are emphasized since both schemes ignore the more important sulphur-gas emissions. The paper discusses the causes and evidence of the volcanic signal and emphasizes its moderation by El Nino events. It concludes with a brief analysis of the contributions made by particulate matter released into the lower troposphere from human activities.
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