Richard Schiffman

The ʻohiʻa is Hawaii’s iconic tree, a keystone species that maintains healthy watersheds and provides habitat for numerous endangered birds. But a virulent fungal disease, possibly related to a warmer, drier climate, is now felling the island’s cherished ‘ohi’a forests.

Marine scientist Christopher Clark has spent his career listening in on what he calls “the song of life” in the world’s oceans.

For residents of the Rocky Mountain region of the United States and Canada, global warming is not an abstract concept.

More than 75 percent of the fruit and vegetable varieties that humans once consumed have already gone the way of the wooly mammoth…