Such events are likely to happen again in the future. J.M. Kiesecker et al., Proc. Analysis of fossil profiles from the sediments of two mountain lakes suggests that past UV radiation penetration has sometimes been greater than during the current period of anthropogenic ozone depletion. 730 and 2964 meters a.s.l., during a June minimum in total ozone. This is important because rapid, prolonged changes may not give enough time for natural adaptation mechanisms.
Results also indicate that extrapolation to different altitudes from a single site is difficult.
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