The oceans are diminishing. Two-thirds of species in the northern Atlantic are being overfished. Some fish that used to be plentiful have been fished to almost extinction. Also, the gigantic trawling nets that sweep up everything in their path catch unwanted things. A quarter of the fish caught in nets are unwanted. Nets also entangle larger creatures, such as dolphins, drowning them.
Climate change is also affecting the ocean. Warmer waters damage or kill algae that fish feed on. There are then less algae-eating fish around, since some starve to death, which means less food for those animals that would usually eat them. The food chain is knocked off and the whole ecosystem suffers.
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