Ben Halpern / NCEAS

This global map shows cumulative human impact across 20 ocean ecosystem types. The map is color-coded to show very high impact (red), high impact (dark orange), medium high impact (light orange), medium impact (yellow), low impact (green) and very low impact (blue). Forty-one percent of the area has experienced medium high to very high impact, scientists say.41 percent of seas heavily affected by human activity, researchers report

Map shows how oceans suffer in graphic detail

41 percent of seas heavily affected by human activity, researchers report