Why is the proposed climate bet for ten years?
Scott Armstrong said that he selected ten years because he wanted to be pretty sure that he would be around to see how things turned out. Interestingly, this fits well with Gore’s position, as stated in his book, Assault on Reason (page 204):
“Many scientists are now warning that we are moving closer to several “tipping points” that could - within as little as ten years - make it impossible for us to avoid irretrievable damage of the planet’s habitability for human civilization.”

because scientist have calculated that if no action is taken to curp with global warming and the continue rising of CO2 level within this ten years will sufficiently cause sea level to raised up to a level that cause iretrievable damages to certain below sea level countries like China and Bangladesh.