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He often made his opposition to nuclear weapons clear.  An episode of Cosmos, "Who Speaks for Earth," dealt with the possibility of nuclear annihilation explicitly.

He often made his opposition to nuclear weapons clear.  An episode of Cosmos, "Who Speaks for Earth," dealt with the possibility of nuclear annihilation explicitly.

From a religious point of view, Sagan was an [[atheist]] or an [[agnostic]] depending upon how it is interpreted. In practice he was an atheist, but as a scientist could never say with certainty that evidence couldn't arise that is currently unknown that would point toward a god force, he is more correctly described as being  agnostic.<ref>http://www.nndb.com/people/324/000022258/</ref><ref>http://www.adherents.com/people/ps/Carl_Sagan.html</ref>

From a religious point of view, Sagan was an [[agnostic]] [[atheist]]; that is, one who does not claim to have absolute knowledge about the existence of god, but believes there isn't one. In practice he was an atheist, but as a scientist could never say with certainty that evidence couldn't arise that is currently unknown that would point toward a god force, he is more correctly described as being  agnostic.<ref>http://www.nndb.com/people/324/000022258/</ref><ref>http://www.adherents.com/people/ps/Carl_Sagan.html</ref>

At the height of his popularity, Sagan became something of a media celebrity, occasionally appearing on popular entertainment programs.  His speaking style became well known, and one phrase of his was often spoofed and referenced in the media&mdash;"'''BILLIONS''' and '''BILLIONS'''"&mdash;with the words emphasized and drawn out, though he never actually used it.<ref>http://www.nytimes.com/learning/general/onthisday/bday/1109.html</ref>

At the height of his popularity, Sagan became something of a media celebrity, occasionally appearing on popular entertainment programs.  His speaking style became well known, and one phrase of his was often spoofed and referenced in the media&mdash;"'''BILLIONS''' and '''BILLIONS'''"&mdash;with the words emphasized and drawn out, though he never actually used it.<ref>http://www.nytimes.com/learning/general/onthisday/bday/1109.html</ref>

Sagan had a notable effect on the space program, being the man who conceived the first written message to go into space, on gold plaques attached to the Pioneer 10 and 11 spacecraft. Later, he would be a part of the team that assembled golden records, containing information on Earth's culture and daily life, that would go out with the Voyager space probes later.

Sagan had a notable effect on the space program, being the man who conceived the first written message to go into space, on gold plaques attached to the Pioneer 10 and 11 spacecraft. Later, he would be a part of the team that assembled golden records, containing information on Earth's culture and daily life, that would go out with the Voyager space probes later.

==Climate change==

==Kuwait Oil Crisis==

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