The Washington Post has an excellent article on the WTO Tuna-Dolphin dispute, stripped of legal jargon and very informative. An excerpt:
There is no sure way to catch tuna without harming other marine life. Dolphins, as well as sharks, turtles and other animals, are unintentionally killed as bycatch in the quest for tuna.
The central question facing governments, corporations, environmentalists and consumers is how much is too much, and whether using a huge net to catch tuna in one part of the ocean is any worse than using them to catch it in other parts.