H

half-life 44-46, 49, 50 Hansen, James 5, 149-151 Harland, W. Brian 27 Haug, Gerald 116, 117 heat waves 129, 173c Heinrich, Hartmut 34-35 Heinrich Events 34-35 hickory 148

historical (written) data 56-57 Hodell, David A. 118 Hoffman, Paul F. 27 Hohokam people 122-123 Holland 37

horizons, of soil profile 76-78, 77 horn 71

Hothouse Earth 30-32, 31

Hudson Valley 147-148

human activity 5, 8, 40, 111, 170c. See also anthropogenic climate change humid climates 75 Hurricane Andrew 129 Hurricane Katrina 129, 173c hydroelectric power 129 hydrogen isotopes 104 hydrogen sulphide 31 hyperspectral imagery 133

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