[RupertEisenhart]

Are you a climate change denier? Are you unaware of the changes that have happened in the last ten thousand years?

[saaarahh]

What is the time span requirements for 'sustainable'?

Everything on Earth will be toast in ~5 billion years.

[RupertEisenhart]

Not sure what your point is, but agriculture needs to change dramatically in the next couple of decades.

Human civilization/all life that wants to keep existing also needs to change dramatically in the next five billion years but I think that is to be expected.