- double-dug beds, with loosened, aerated soil
- usage of compost, for the soil health and vigor
- close plant spacing, to protect soil microorganisms, reduce water loss, maximize yields
- companion planting, for the optimal use of nutrients, light and water
- production of calories for the farmer and carbon for the soil
usage of open-pollinated seeds, to preserve genetic diversity and enables gardeners to develop their own acclimatized cultivars
There may be as little as 40 years of farmable soil remaining globally. For every pound of food eaten, 6 to 24 pounds of soil are lost due to water and wind erosion, as the result of agricultural practices.
95% of the seed varieties ever grown in agriculture are now virtually extinct. Much of this is due to the growing of relatively few crops, and the frequent use of hybrid seeds for the crops that are grown.
Global warming may cut agricultural production in half within as little as 20 years.
With supplies of petroleum and natural gas running out, conventional agriculture—heavily dependent on these resources—will become more expensive, raising food prices accordingly.
The number of farmers globally keeps decreasing. Many people would like to farm but are unable to afford the land and equipment current wisdom says is necessary for a farm to be economically viable.