I think as manufacturing and agriculture have become less labor intensive, a bigger proportion of the cost of things has been energy. So in a way, carbon emissions sort of are being priced into things naturally, and I'd guess the trend is increasing. In some extreme technological utopia, energy would be the only cost of food and products, meaning it's all carbon.

> To me charging market price for water seemed obvious and easy till the comments here pointed out what should be obvious: the farmers Steve getting their water from the faucet but from their own wells, creeks etc. So that solution is pretty hard to do on practice.

It doesn't seem that hard to measure it. The large scale would justify the cost.