http://geology.about.com/gi/dynamic/offsite.htm?site=http://maia.usno.navy.mil/eo/leapsec.html
The deceleration of the Earth's rotational speed is caused by the conversation of angular momentum--mass stays the same, diameter increases, so rotational velocity must decrease.
Given how much the diameter has increased from dinosaur days, the cross-sectional area of the Earth as viewed from the sun would have increased significantly. This increase in thermal flux would result in an increase in the temperature of the Earth, all things being equal. This change in thermal flux over time may help explain a lot of open ended questions about the history of the Earth's climate.
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