The study conducted by Dr Ken Caldeira from the Carnegie Institution's Department of Global Ecology in Stanford, California says that human activities are producing so much carbon dioxide that under the present circumstances the world's oceans are all going to turn acidic by 2100 and severely threaten marine life.

"If Carbon dioxide from human activities continues to rise, the oceans will become so acidic by 2100 it could threaten marine life in ways we can't anticipate," the report issued by the Royal Society, UK quoted Caldeira co-author of the report as saying.

Scientists further said that the oceans were an important part of the ecological system and helped in slowing global warming.

Marine plants, they said, soaked up carbon dioxide and converted it into food during photosynthesis.