On 4/7/15 12:40 PM, oriel36 wrote:
The planet warms every time a location turns into solar radiation within each 24 hours and cools as the stars of the great celestial arena come into view as the planet turns back into the shadow of the Earth.

It is the cooling that is reduced by greenhouse gasses.
http://edu-observatory.org/olli/Climate/Week1.html


The Carbon Dioxide Greenhouse Effect
http://www.aip.org/history/climate/co2.htm

In the 19th century, scientists realized that gases in the
atmosphere cause a "greenhouse effect" which affects the planet's
temperature. These scientists were interested chiefly in the
possibility that a lower level of carbon dioxide gas might
explain the ice ages of the distant past. At the turn of the
century, Svante Arrhenius calculated that emissions from human
industry might someday bring a global warming. Other scientists
dismissed his idea as faulty.

In 1938, G.S. Callendar argued that the level of carbon dioxide
was climbing and raising global temperature, but most scientists
found his arguments implausible. It was almost by chance that a
few researchers in the 1950s discovered that global warming truly
was possible.

In the early 1960s, C.D. Keeling measured the level of carbon
dioxide in the atmosphe it was rising fast. Researchers began
to take an interest, struggling to understand how the level of
carbon dioxide had changed in the past, and how the level was
influenced by chemical and biological forces. They found that the
gas plays a crucial role in climate change, so that the rising
level could gravely affect our future. (This essay covers only
developments relating directly to carbon dioxide, with a separate
essay for Other Greenhouse Gases.

The History of Atmospheric Carbon Dioxide on Earth
http://www.planetforlife.com/co2history/index.html