R

radar 134-136, 138 radioactive decay 44, 45, 47, 54 radioactivity 54

radiocarbon dating. See carbon-nitrogen dating radiometric dating 42-53 rainfall and desertification 14

and growth of civilizations 115

and North Atlantic air pressure patterns 15 and origins of agriculture 117

and speleothem research 95 and weathering in arid environments 65-66 rain forests 79

rapid climate change. See abrupt climate change rate of climate change 8-12 red horn coral 112 reforestation 38 regolith 78 relative dating 43 remote sensing 131-142, 141 reservoirs 119, 158-159 resolution 133 Richardson, Gill 118 Rind, David 38 Rio Summit 171c rivers, ancient 136-139 Roman Empire 36 rubidium-strontium dating 49 Rutherford, Ernest 45 Rwanda 129

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