Access A Broad Range of Paleoclimatic Studies. Current debates regarding potential man-induced modification of climate make this volume especially timely. Introductory sections address the major and minor physical controls, or drivers, that affect Earth's climate. Several chapters describe the naturally occurring range of variation of climatic conditions and illustrate past changes in global temperatures. Case studies show how ancient temperature conditions are determined, as well as new techniques that have significant potential as proxies for assessing paleoclimates. Several chapters demonstrate the magnitude and length of duration of numerous temperature variations, which occurred during geologic time periods.