O

Obliquity, 103 104, 105, 106 109, 110, 111, 112, 113, 114, 115 18, 119, 120

Ocean:

acidification, 120, 133 4, 237, 254, 260,

265, 291, 367 8 carbon cycle, 381 2

360 1, 362 3, 364 currents, 133, 161, 236 7, 265, 271 2,

351 2, 353, 370 nutrient cycle, 382 3 Ocean effects:

global scale, 269 71 local scale, 265 7 regional scale, 267 9 Oceanic uptake of carbon, 357 8 Oceanographers' tools, 351 3 Odours, 312

Oligocene, 112, 119, 120, 134 Orbital induced climate change, 112 Overturning circulation, 79, 95 6, 155, 177 8,

345, 351, 353 6 Ozone (O3), 3, 11, 14, 17, 24, 46, 70, 71 2, 79, 80, 83, 88, 89 90, 93, 150 1, 154, 159 60, 309, 360 1, 431

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