I came across this link earlier today and been captivated by the potential for change that this action could create. While it is clearly a disruptive concept to conventional agriculture, maybe Vermont is the perfect place to make a start. Please note that this bill was tabled for the season. A link to the actual text of the bill is here.
I can say that there are already too many certification systems and compliance requirements for doing the right thing, and so my eyes role at the thought of another program ontop of those already in place (animal friendly-welfare, organic, grassfed, etc.), however there needs to be a place for something that has metrics directly associated with the bigger issue of climate change (i.e. tons carbon).