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A core sample from the accumulation of snow and ice that have
recrystallized and have trapped air bubbles from previous time periods, the
composition, especially the presence of hydrogen and oxygen isotopes, provides
a picture of the climate at the time.

disposal systems that burn solid waste or other materials and reduce volume of waste. Air pollution and toxic ash are problems associated with incineration.


A chemical that kills insects.

substances used to kill insects and prevent infestation.

Incoming solar radiation.

The expenses, monetary or otherwise, borne by those who use a resource.

Planning so that those who reap the benefits of resource use also bear all the external cost.