Paleontologist Riley Black traces the cooperation among plants, animals, and ecosystems in “When the Earth Was Green.” ...

Earth's oceans may have been green for billions of years until the first photosynthetic organisms flooded our atmosphere with oxygen.

Rep. Mark Genda, R-Frankfort, once again introduced a bill that would legalize alkaline hydrolysis, a "green" form of cremation promoted as more environmentally friendly than other options.

As the spring equinox approaches, northern lights hunters will scour the skies for breathtaking displays of color.