The effects of mining activity contribute to concerns about a number of prominent waterways.
Nuclear pollution can't be ruled out as part of the syndrome that's attacking starfish, a scientist says.
The awe-inspiring offspring of our industriousness can live through the ages, but the gross byproducts of our civilization can also cause lasting damage.
Animals downsize after boosted carbon dioxide levels and soaring temperatures.
What matters in the long-run is how truly special a species is in the grand scheme of life on Earth.