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In 1997 a second international association was created, the International Association for Environmental Philosophy, with an emphasis on _____________________________. It publishes a journal called Environmental Philosophy.

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A long-term ____________ between these natural sources and sinks leads to the background, or natural, level of CO₂ in the atmosphere.

Human activities increase atmospheric CO₂ levels primarily through the burning of ____________.

The next most significant greenhouse gas is surface, or low-level, _________.

A carbon footprint is composed of two parts, a primary and _____________ footprint.

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