FREEDOM

 C a r b o n    d i o x i d e

  Carbon dioxide is a colorless and non-flammable

  gas at normal temperature and pressure.

  carbon dioxide is an important constituent of our planet's air.

  A molecule of carbon dioxide (CO2)

  is made up of one carbon atom and two oxygen atoms.

  Carbon dioxide is an important greenhouse gas

  that helps to trap heat in our atmosphere.

  Without it, our planet would be inhospitably cold.

  However, a gradual increase in CO2 concentrations

  in Earth's atmosphere is helping to drive global warming,

  threatening to disrupt our planet's climate

  as average global temperatures gradually rise.

  Carbon dioxide is the fourth most abundant component

  of dry air.Carbon dioxide plays a key role in Earth's carbon cycle

  the set of processes that cycle carbon in many forms

  throughout our environment.Carbon dioxide

  is the most abundant gas in the atmospheres of Mars and Venus.

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