Which of the following statements is true of "Earth’s Ozone Layer"?

JB: After 30 years of steady decline, Earth’s ozone layer is thinner but seems to be stable. A ban on ozone-depleting CFCs is largely responsible. Computer modeling gives reason to hope for an almost full recovery of Earth’s ozone layer within 60 years. But this sort of modeling is difficult -- and its predictions aren’t iron-clad.
DB: And some models show the ozone layer could face a new threat -- from global warming. Drew Shindell, an atmospheric scientist at NASA’s Goddard Institute for Space Studies in New York City, talked with us about his computer models of climate.

Failure to find common economic ground came just weeks after voters in France and the Netherlands dealt, what some observers call, a lethal blow to the Union’s proposed new constitution. And they say the first casualty of Europe’s latest crisis is EU’s further expansion. For years, European Union’s enlargement was viewed as necessary for maintaining stability and prosperity of the Continent. Deeper political integration, promised by the new Constitution, was supposed to strengthen the bloc’s coherence. But many analysts say the process has met with unsustainable expenditures, institutional inefficiencies and an ever-expanding bureaucracy.