Detectability Index (IMAGE) Arizona State University Caption On the left, the oxygen-producing biosphere (photosynthesis/respiration) is fed by nutrient runoff from land. On the right, if you increased water on Earth enough to cover all land, then nutrient runoff is stopped. This significantly reduces how much oxygen the biosphere can produce. Credit D. Glaser/ASU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.