Index - O

Ocean debris, 84, 85t

Ocean dumping, 84

Oceans
     dumping/debris, 84
     global warming and, 44
     oil spills/runoff in, 83-84
     sea level rise, 46, 48

Ohio, 2t

Ohlone tiger beetle, 149

Oil drilling
     in Arctic National Wildlife Refuge, 27-28, 30
     in Arctic National Wildlife Refuge, public opinion on, 53
     caribou, calving locations of radio-collared female during 1983-99, 39f
     land status, generalized view of, by 1961, 37f
     terrestrial polar bear den locations (Beaufort sea population), 1981-2000, 38f

Oil industry, 52

Oil runoff, 83-84

Oil spills
     birds threatened by, 132
     Exxon Valdez oil spill, 83-84, 132, 133f
     water pollution from, 83-84

Old-growth forests
     endangerment of, 72
     spotted owls in, 137

Orangutans, 127, 127f

Ordovician, 1

Oregon, 64 (t4.5)

Overfishing, 89-90, 100

Owls, 137
     See also Northern spotted owl

Ozone layer
     depletion from greenhouse gases, 43
     greenhouse gases and, 42
     phytoplankton depletion and, 91