…Among the changes RGGI should adopt is a fixed decline in the emissions cap of about 2.275 short tons/yr, rather than the 2.5pc/yr reduction now in place, Boston-based environmental policy think tank Acadia Center said in the report released yesterday. At the same time, the nine-state power sector trading program should extend the cap out until 2030, aligning the program with the deadline for states to meet CO2 emissions rates set out by EPA in its Clean Power Plan, the report said…