Sustainability has a simple definition, known by all farmers, universally measurable, your fields & grasslands are building soil carbon. Fields & grazing practices losing Soil-C are Unsustainable.

Soil Biology is our only way to rapidly and massively draw down CO2 from the air to offset our ongoing and past carbon emissions, It Could safely and naturally restore the hydrological cycles by increasing biogenic aerosols and cloud albedo that could readily cool the planet by the 3 watts/m2 needed to offset the now locked in greenhouse warming effects and avoid the Storms of Our Grandchildren.

The French have lead the way recognizing Soil Carbons’ value and committing to build Soil Carbon by 0.40% annually. Putting them on the road to Carbon Negativity before any industrialized country. 25 nations have signed on to 4p1000. 100 of the 196 countries in Paris submitted plans to reduce CO2 via agriculture, forestry and replacing soil carbon into their programmes.
http://4p1000.org/understand

Farmers Must be Payed for the Climate services rendered by sequestering Soil-C.