I do not believe in this topic. Humans are not so many as we think. Even if we were so many, why reduce for what? Many people think that food will not be enough in the future but it is not true. We have a lot of places where we can cultivate. Countries like Canada and Russia are actually empty. People can easily move there if there are nowhere to go. With science, we can easily plant anywhere. We are already eating modified fruits and vegetables. We are doing great. We do not need to kill people or to reduce the population.