Which is unnecessary given that fish can easily be farmed.
More people means more pollution - live in any large city to witness this.
Go to an American city, then visit a third world city.
And I don't want to live on a planet that is wall to wall people
Remember that third world city you just visited? The one with horrendous air pollution and a river that is little more than a sewer? Compare that to any American city.
Those are your choices. You can choose not to reproduce children that will care about pollution and freedom. The rest of the world won't stop producing children that won't care about those things.
The future is wall-to-wall people. The question is, will they care to clean up pollution and give you religious freedom, or will they run raw sewage into the river and make you live under sharia law?
Not really. China and India are experiencing plunging fertility rates, with the rest of Asia experiencing the same, to a lesser extent. In a couple of decades, they will probably drop below replacement level. Africa is going to lose population due to AIDS and dropping fertility rates.
The word population will grow for the next few decades, level off and then start to decrease mid-century. There are few places that you're seeing an increase in fertility rates lately (with the notable, and surprising, exception of Russia).