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.
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.
ozone depletion:131
ozone depletion
ozone at middle latitudes has declined, but by a much smaller extent (a decrease of about 4–5 percent).