This time, it's a hotter, waterier, wilder Earth that world leaders are trying to save.
The last time that the nations of the world struck a binding agreement to fight global warming was 1997, in Kyoto, Japan. As leaders gather for a conference in Paris on Monday to try to do more, it's clear things have changed dramatically over the past 18 years.
Some differences can be measured: degrees on a thermometer, trillions of tons of melting ice, a rise in . . .
