SciDev.Net: This policy brief, compiled by 16 international agencies, considers what policymakers can do to help fisheries and aquaculture cope with climate change. Fish and shellfish provide essential nutrition to three billion people worldwide and livelihoods to more than 500 million in developing countries. But climate change is modifying key environmental factors — including air and sea surface temperatures, rainfall, sea level and ocean acidity — that will change the distribution …