Dark Ages Cold Period
   Asia
   Europe
   Miscellaneous
   North America
   South America

Debris Flows

Decomposition
   Agriculture
   Desert Species
   Grassland Species
   Processes and Properties
   Woody Plants
      Conifers
      Deciduous Trees

Deep Water
   Formation
   North Atlantic Deep Water

Density
   Stomatal
   Wood

Deserts
   Biological Soil Crusts
   Expanding or Shrinking?
   Higher Plants
      Basic Responses to CO2
      Stress Reduction by CO2
   Water Use Efficiency

Dimethyl Sulfide

Disease
   Animals
   Corals
   Humans
   Plants
      Agriculture
         Legumes
         Other Plants
      Other
      Trees

Diurnal Temperature Range

Drought
   Africa
   Asia
   Australia/New Zealand
   Central America
   Europe
   General
   Global
   North America
      Canada
      Mexico
      United States
         Central
         Eastern
         Entire
         Southern
         Western
   Solar Influence
   South America

Dust
   Biological Implications
   Climatological Implications
   Windblown Transport