Collectively, the power industry sucks in approximately 80 trillion gallons of water annually to cool their equipment. In the process, they kill on a massive scale fish, larvae and other aquatic organisms.
Even if you only add one night of fish to your dinner repertoire each week, you're cutting down on your carbon footprint, adding beneficial Omega-3 fatty acids to your diet, and casting a vote against bad beef.
What has long been considered the obvious answer to collapsing fisheries -- restrictions on fishing -- has been shown time and time again to be the wrong answer. The right answer is enlightened use of markets.