Wallace S. Broecker One of the world's leading climate scientists challenges Greenpeace's opposition to storing CO2in the depth of the oceans. Most of us who are concerned about global warming agree that an important part of any strategy designed to stem the ongoing build-up of greenhouse gases in the atmosphere will be to capture and store CO2. Potential storage sites include spent oil fields, saline aquifers, layered basalts and the deep ocean. "Point pollution' While Greenpeace accepts the inevitability that CO2 will be captured and stored, it strongly opposes storage in the deep sea. As it is clear that virtually all the CO2 released to the atmosphere as a result of fossil fuel burning will ultimately find its way to the deep sea, its objection is focused on the "point pollution' created by purposeful injections of CO2. The fear is that such an activity will put at risk benthic biota