The text doesn't really answer any question. I just accuses (and rightly so) the practices of abortion, euthanasia, homosexuality and contraceptives that are usually defended by people who want to curb overpopulation (though I can assure you there is no "conspiracy behind it all").
The facts that the resources of Earth are limited and that we consume resources are not questionable, right? Sure, we can and must come up with new ways to use them and recycle them so as to minimize waste and make goods available for more people.
However, somethings will never be available to all. Cars that run on petrol, for instance, or swimming pools in their backyards. If everyone in the world were to have those today, petroleum and fresh water would soon be over.
Let's suppose, for the sake of the argument, that we manage to recycle everything we use (!) and that our means of producing energy are the most efficient and clean possible. Even then, the Earth having limited resources, will there be a limit to the maximum number of people this planet can accomodate giving a decent life to each.
Yes, it would be possible to give a decent life to every human being alive in Earth today if income was distributed more equally. But such is not the case. While we work to make it the case, to get the poorest people to have access to basic human needs and basic education, it is important that we teach everyone that they shouldn't have more kids than they can support.
Someone pointed out that, when development comes, birth rates naturally come down. That is true. But by what means do they come down? Contraceptives, abortions, homosexuality and all the things the Catholic Church condemns, which are every day more accepted in developed countries.
Don't fool yourselves: the population of Europe did not cease to grow as it did in centuries past thanks to NFP and abstinence... In fact, their inhabitants are more promiscuous now than they ever were.
So, we are faced with a great challenge: on the one side, make it so that human population doesn't exceed what the Earth (or the country, since there is no free movement of people between nations) can support; on the other, we must not go against God's natural laws and not disrespect His love for us. Impossible? I have faith that it is not.