Ozone’s Long Path to Recovery

The holes that formed in the ozone layer over Antarctica in 2011 and 2012 are a study in contrasts. The 2011 hole ranked among the ten largest recorded since the 1980s, while the 2012 hole was the second smallest. Why were they so different? Is it a sign that stratospheric ozone is recovering?

Study Links BP Oil Spill To Dolphin Deaths

US government scientists have for the first time connected the BP oil disaster to dolphin deaths in the Gulf of Mexico, in a study finding direct evidence of toxic exposure.