How could Orbital Changes be causing climate change?
Milankovitch Cycles
Eccentricity - Every 100,000 years the Earth orbit changes from circular to slightly oval and back
Obliquity - every 41,000 years the tilt of the Earth moves from 21.5 degrees to 24.5 degrees
Precession over 26,000 years
How could Volcanic Activity possibly cause climate change?
Ash and sulfur dioxide can block the sun reducing temperatures on Earth, this is short-term (1-2 years) but the effects from sulfur dioxide can last for longer.
