To prolong the life of earth is to reduce the number of human populations. Human should not try to revise the intent of god, more populations means more war, more garbage, more pollutions, more exhaustion to earth's limited resources and to top the list, more humans are trying to think and act like they are god!. I strongly support lower fertility rate to bring the earth to its equilibrium and optimal level. Without earth, there will be no human beings, with more human beings there will be no earth.