Rivers can change colors as time passes, and this is linked to ecosystem health
Some US waterways have become greener and others yellower, but overall many have changed.
Some US waterways have become greener and others yellower, but overall many have changed.
Healthy rivers are flowing rivers, say researchers.
Basically, this is boot camp for training antibiotic-resistant bacteria.
The visual effect was extremely strong, and everything was completely safe, activists say.
The Alps may seem like a paradise, but the environmental situation is extremely dire. Just one in ten rivers are ...