Subject: What will the climate of the Earth be in 4 million years?

I'm doing this project at school in which the students are put in groups and 
given topics and we have to predict how those things will change in 4 million 
years.  My topic is plant evolution and I figured that the climate of the Earth 
would be a big factor of how plants will evolve.  I'd like to know if the Earth 
in 4 million years would be warmer or cooler or if it would stay the same and 
what factors would make the temperature change or stay the same.  I would really 
appreciate it if you could help me out.  Thanx.        

Re: What will the climate of the Earth be in 4 million years?