In interpreting the results, it is important to recognize that there is considerable uncertainty in the values of the nonmarket cobenefits. The values that society attaches to cobenefits such as GHG emission reduction, and livestock manure odour reduction will likely change in the future as climate change becomes a more heightened concern, and not-in-my-backyard (NIMBY) pressures increase with population pressure and increases in rural residential settlements. Furthermore, in North America at least, environmentalists and some left-leaning politicians are already arguing that generating energy from such renewable sources should not be questioned on economic grounds but promoted as a de facto choice. These trends and developments will undoubtedly have implications for the politics and economics of generating energy from renewable sources.