Agence France Presse: The future food security of millions of people is at risk because over-fishing, climate change and pollution are inflicting massive damage on the world’s oceans, marine scientists warned this week. The two-thirds of the planet covered by seas provide one fifth of the world’s protein — but 75 percent of fish stocks are now fully exploited or depleted, a Hanoi conference that ended Friday was told. Warming seas are bleaching corals, feeding algal blooms and changing ocean …