Daylight saving time

Many countries, and sometimes just certain regions of countries, adopt daylight saving time (DST), also known as summertime, during part of the year. This typically involves advancing clocks by an hour near the start of spring and adjusting back in autumn (“spring forward,” “fall back”).

Dead sea

A landlocked salt lake between Israel and Jordan is so salty that almost nothing can live in its waters. It is 1,349 feet (411,17 meters) below sea level, making it the lowest on the earth’s exposed crust.

Debt-for-nature swap

An arrangement in which a certain portion of international debt is forgiven in return for the borrower’s pledge to invest that amount in nature conservation.


A named characteristic of broadleaf trees, such as maple, oak, birch, and cottonwood.

Deciduous trees

Broadleaf trees lose their leaves and cease to grow during the dry or the cold season and resume their foliage and grow vigorously during the hot, wet season.


A fall in prices, such as that caused by currency devaluations.


A type of government in which citizens hold political power either directly or through elected representatives.

Dengue fever

Mosquito-borne (Aedes aegypti) viral disease associated with urban environments.


Location: Northern Europe Official name: Kingdom of Denmark Formation (date of independence / date current borders were established): 950 / 1944 Capital city: Copenhagen Population: 5.5 million / 336 people per sq mile (130 people per sq km) Total land area: 16,639 square miles (43,094 square km) Language(s) spoken: Danish Main religions: Evangelical Lutheran 95%, … Read more


A land run by another, usually more powerful, country.


A natural grouping of minerals, such as oil or coal, within the Earth.