A greenhouse warming connection.

Discusses research which studied how rising levels of greenhouse gases will affect ozone depletion over the Arctic in coming years. Research by Shindell et al in this issue; Prediction that ozone (O3) levels will continue to fall; Impact of greenhouse gas buildup on the stratosphere; Rapid loss of ozone throughout the winter polar vortices; Ozone in the Arctic polar vortex; Cautions about Shindell's hypothesis; Hallmark of Arctic vortex.