Somewhere on the internet some twit commented that TZM/TVP "boils down to ... population control". The vast majority of comments on discussion forums don't merit any response, and this glib and ill-thought out (un thought out) one doesn't either, but it's another in to explaining the tenets of TZM/TVP.
TZM/TVP point out the undisputable scientific fact that the earth has a carrying capacity. Undeniably, this is the limiting factor on the human population. We might not be able to enumerate this, but it is certainly there. We can keep using resources faster and faster, but we will reach this absolute limit.
TZM/TVP say that the only sensible response to this is to use the resources efficiently, to give us the maximum chance of true prosperity as a species.
As to population control, what do you call starvation in the third world while in the first world people die of lifestyle diseases such as those related to obesity? What do you call sending young men (mainly) to death in wars? What do you call leaving curable diseases uncured to preserve financial profit? TZM/TVP calls to an end to all population control, but accepts that there are natural limits.