Bob Giddings Green Bay, Wisconsin Calculating the total mass of the universe is not simple, because most of the mass is invisible. In a pie chart of the contents of the universe, only 5 percent is ...

The world’s glaciers are in dire health with almost 40% of their total mass already doomed, even if global temperatures stopped rising immediately, a new study has found. Researchers estimate glaciers ...

A green accounting method called “mass balance” certifies that something was manufactured with recycled plastic — just not necessarily much of the bottle making the claim. By Julie Creswell and Hiroko ...