Extending human life
There are researchers who are working on this now, saying it's possible to extend human life to say 200-500 years. I don't know if they'll ever be successful but I hope not. The average human lifespan has already nearly doubled in the last 150 years in most western countries primarily due to advances in medicine.
My feeling is with the human population already over 6 billion and climbing and placing a tremendous strain on the earths resources it would almost be unethical to increase human life considerably more and further excaberate this problem.
What are some other thoughts on this?