Should we build a dam or preserve a national park instead? The answer may not always be obvious.
In 2020 many businesses are gearing up for another round of action on sustainability.
A new green energy vision for Ukraine takes into account the challenges, yet it falls short on actual goals.
Africans are closing the door on out-of-date standards for road fuels, and vehicle emissions from old, inefficient imports.
"Events like this highlight the need for responsible, timely deorbiting of satellites for space sustainability," said industry expert LeoLabs.
There's much to learn as the 2019-nCoV outbreak evolves, but Chinese researchers think it originated in bats or snakes.