Wonder of wonders, Paul Krugman of the New York Times is optimistic about Copenhagen. What’s more, he calls cutting greenhouse gases (GHGs) both affordable and essential. Reducing GHGs may even help the economy, so there’s no reason to wait. Cap and trade systems have worked before; they can again.

OUR TAKE
Youth Activists Triumph in Groundbreaking Climate Trial
A landmark legal decision has overwhelmingly justified every human being’s right to a healthy environment. The huge victory by young climate activists in Montana is a win for young people all over the world whose future will undeniably be shaped by the effects of climate change. The case,