The solar cycle (or solar magnetic activity cycle) where the Sun has an 11 year cycle.
The inclination of the Earth's orbit which has an approx 100000 year cycle.
Our solar system's celestial location within an arm of the Milky Way.
These things DO have bearing on our humble little blue rock; but that negates the teeth gnashing by the commie pinko's.
And don’t forget that it’s apparently warming up on Mars.
I guess the Mars Rover didn’t have emission controls.
http://news.nationalgeographic.com/news/2007/02/070228-mars-warming.html