Forget about population. Instead, kill like 12 birds with one stone, and equalize the third world with the first.
If you want to talk about the environment, the mining capacity in the developed world mostly consists of very scarce things like oil, natural gas, etc, and a few things like timber that would be too expensive to ship for a large portion of its applications. Whereas, if you look around you, 90% or more of what you see will have been pulled out of the ground at some point.
They still require the same amount of time and effort to mine, process, finish, package, ship, and sell that they did 30 years ago. In many cases, the same amount it did 100 years ago. You are living on the backs of hundreds, if not thousands of laborers you'll never meet. Most of them have much better things to worry about than climate change, like how they'll feed their families, or where to get clean water. They'll use anything they can to make their lives easier, they would strip a forest high and dry of panda bears, tigers, cancer cures, firewood, and whatever else they can sell to the poachers that can sell to people moderately more privileged than themselves. And you cannot possibly blame them, because you'd do the same in their situation.
Poverty and inequality is a disaster for the environment. We have it at the scale we do because the west demands cheap manufactured goods. Ironically, probably the most environmentally friendly material you can choose right now for anything is plastic, because some of it will have been extracted and produced by chemical plants in the first world. Saying that given the chance, the 3rd world would ask for the same is kind of missing that we're only able to demand so much because human lives are so cheap. Particularly offensive is complaining about China wanting meat when a lot of their workers live on little more than a bit of rice every day. The suburban explosion, our own pet ecological nightmare, happened because of the shift to a service economy and a sudden boom in availability of the manufactured goods and core building materials needed to supply so many new families with housing.
TLDR version, if you want the population to stabilize, the first step is to boost the rights, education, and living conditions for the people making your monitors. New technology and cheaper parts are only going to exacerbate the problem until you do. You can have cheap monitors, or you can have a population capable of considering their effects on climate without killing themselves. </rant>