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

Although the Earth’s been decidedly blue for 600 million years, rising populations of phytoplankton caused by rising ...

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

Instead, they were a striking shade of green, shaped by ancient microbial life and the chemical composition of early seas. Now, scientists warn that Earth’s oceans may be shifting back to a ...

For a long stretch of Earth’s history, our planet might have looked green from a distance, instead of the pale blue dot we know today. Earth’s green period, which lasted from around 3 billion ...

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.