Tipping Points

The tipping points that I found in Emanuel (2007), UC Berkeley News Center, and Scientific American:

• Periodic oscillations of the Earth's orbit that primary effects the Earth's orientation
• Water vapor accumulates in the atmosphere, causing the atmosphere to warm, allowing more water vapor to accumulate
• Ice and snow can accumulate, making it's way toward the equator. The ice and snow would reflect sunlight back into the atmosphere causing the planet to continue cooling
• Arctic Sea ice has essentially diminished past a certain threshold, claiming that it will be a relatively rapid increase to losing all of the ice
• Major changes in the ocean currents or air circulation 
• Ocean temperatures or acidity