The effects of greenhouse gases could be even worse than we thought.
Scientists and oceanographers from Germany have found a decline of more than 2 percent in ocean oxygen content worldwide between 1960 and 2010. Because oxygen in the global ocean is not evenly distributed, the 2 percent overall decline means there is a much larger decline in some areas of the ocean than others - severely impacting marine life species as we know them.
Declining oxygen levels can worsen global warming. Sea levels could rise twice as much as previously predicted.
See original article here.