N

National Assessment 225-226, 237c National Wildlife Refuge system 158166, 161 natural gas 38 natural greenhouse effect 10 natural refuges 141-170 Natural Resource Conservation Service,

USDA 73 negative radiative forcing 16, 17 Nelson, Frederick 206-207 Nemani, Ramakrishna 68 Nepal 174

New Direction for Energy Independence

Act 168 Newell, Brent 70 New Orleans, Louisiana 191 New York City 134-135 niche 101

Nielson, Dianne 217-218 Nisqually National Wildlife Refuge

163-164 nitrogen 67

nitrous oxide (N2O) 10, 20, 40-41, 73, 78 Nixon, Richard M. 145 "Noah's choice" 166 Norby, Richard J. 105 Norgay, Tenzing 173

North America 185, 186. See also United States

North Atlantic Deep Water 182

northeastern United States 186-189

Northern Hemisphere 105

northern plains 65

no-till planting 77, 78

nutrients 109

nutritional value, of crops 66, 67

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