Before Soylent Green was people, it was this

France's beaches of Brittany are again plagued with a proliferating plight of plant life; i.e., they are being covered with rotting green algae. I think I posted on this before when a horse died after getting trapped in a particularly noxious patch with high concentrations of hydrogen sulfide gas. Well, it's still a mess. As if we didn't have to worry about overfishing, we humans are increasingly making the oceans unsuitable for normal existence (ours, and what lives in them).

Seaweed invasion plagues France's pristine Brittany

Now, looking at this, there might be something to those alternative energy ideas of going directly from algae to biofuel.