And your evidence for this is?
To continue supporting even our current population will force us to devastate our planet
And your evidence for this is?
What about raising the standard of living of all those who are already on the planet
As the article clearly states, the obstacles to doing this are social and political, not environmental or technological. People are starving or living at bare subsistence level, to put it bluntly, because our social systems suck at empowering people to make a better life. We allow predatory individuals, whether they are tinpot dictators or investment bankers, to siphon off resources they don't need and will squander anyway at the expense of others. That is what we need to fix.
Should we live in a world void of natural beauty?
No, and we don't.
before we poisoned the seas, melted the ice caps and drained the soil of its nutrients.
And your evidence that this is happening is? More precisely, your evidence that all these things are worse than they were, say, 1000 years ago, is?