It does the most destruction, it has the most land, it doesn't produce much food that people actually eat. So if you can increase your gardens, you can get rid of agriculture. I think, in the near future, it should be a banned activity. Agriculture is the most destructive activity on the face of the earth. It is responsible for poisoning sixty percent of our water supplies, and ruining most of our landscape.
Mining is a minor activity compared to agriculture, when it comes to soil destruction.
We can't lose much more soil in Australia. If you look at the number of acres of land available per head, plotted over the last century, it's in steep decline. We hardly have any land left on which to grow food. In the coming year, we are 45 days short of food. So you are running into real problems.