Without any regulation, coal - and oil - burning utilities managed only 10 % voluntary reductions of mercury pollution over the same time. (polluterwatch.com)
Grants to local communities for such projects, along with calls for voluntary reductions in energy consumption, are part of the plan. (scientificamerican.com)
Reasons for the 2006 - 2012 trend include an increase in plunger lift use for liquids unloading, increased voluntary reductions over that time period (including those associated with pneumatic devices), and RECs use for well completions and workovers with hydraulic fracturing. (energytomorrow.org)