Grist: Heres something we dont get to say very often here at Grist dot org: Good news, humans! Remember the hole in the ozone layer? Well, three decades after countries started banning the chemicals destroying it, the ozone layer is on the mend, according to a study published Thursday in the journal Science. While a full recovery isnt expected until mid-century, researchers found that the seasonal hole in the ozone layer over Antarctica is shrinking. The hole, which was discovered in 1984, was caused...