The composition of our air determines many things: how much of the sun's radiation is held in, warming the earth; our ability to breathe; the growth rate of plants; and more. As an invisible component of our systems, air holds special challenges for scientific study, yet its qualities are crucial to the existence of life on Earth. To explore what scientists investigate when they study air and how they do it, take a look at some key questions and clips.

Greenhouse Gases

How much carbon is human activity adding to the atmosphere?

Human Interactions/Societal Needs

How do scientists monitor global change?

Climate of the Past

What is the climate record of the Holocene and recent past?

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