OCALA - By creating a temporary landmark on Friday, local students hoped to play a role in making a lasting impact on worldwide attitudes toward global warming.

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A much-discussed idea to offset global warming by injecting sulfates into the stratosphere would drastically affect the ozone layer. A new study, led by NCAR, warns that such an approach might delay recovery of the Antarctic ozone hole by decades and cause significant ozone loss over the Arctic.

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The rule of unintended consequences threatens to strike again. Some researchers have suggested that injecting sulfur compounds into the atmosphere might help ease global warming by increasing clouds and haze that would reflect sunlight.

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