algal blooms

It’s becoming increasingly common to find seals washed up on Southern California beaches—the victims of a potent neurotoxin called domoic acid. And it’s not just seals; dolphins, whales, and seabirds are falling prey, too. But not fish.

Algal blooms are gross.

One of the troubles with agriculture is the need for farmers to apply fertilizer. The plants don't soak up all of it, which inevitably results in fertilizer running off into lakes and rivers.