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Dewpoint
The temperature to which the air must be cooled for water vapor to condense.
Diagenesis
All of the changes that occur to a fossil (or more generally any sediment) after initial burial; includes changes that result from chemical, physical as well as biological processes. The study of diagenesis is part of taphonomy.
Diatomite
Diatomite, or diatomaceous earth, is a siliceous sedimaentary rock formed from the accumulations of diatoms or other nanoplankton.
Dichotomous Choice
Offers respondents to a contingent valuation survey specific dollars and cents choices, for example would you be willing to pay between $10 and $20 per year to improve visibility at the Grand Canyon. Generally these amounts are varied between participants.
Diminishing Marginal Utility
The principle that says that as an individual consumes more and more of a good, each successive unit increases her utility, or enjoyment, less and less.
Diminishing Relative Value
The principle that if all other factors remain constant, and individuals relative value of a good will decline as more of that good is obtained. Accordingly, the relative value of a good will increase, other factors remaining constant, as an individual gives up more of that good.
Diminishing Returns
The principle that says as one input increases, with other inputs fixed, the resulting increase in output tends to be smaller and smaller.
Diminishing Returns to Scale
When all inputs are increased by a certain proportion, output increases by a similar proportion.
Diorite
Igneous plutonic rock, less mafic than gabbro, but more mafic than granite and granodiorite; rough plutonic equivalent of andesite.
Dioxin
Any of a group of toxic chlorinated compounds known chemically as dibenzo-p-dioxins (or the most toxic of these compounds, 2,3,7,8 tetrachloro dibenzo-p-dioxin). They are produced inadvertently as a by-product of chemical production or combustion and are widespread pollutants in the environment.

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