Tom Carper (D-Del.) has said he will be able to support the legislation if it:

  • includes provisions to mitigate pollutants like nitrogen oxide and mercury found most widely in the northeastern United States;
  • moves to a more just allocation system — one that devotes more credits to cleaner energy sources;
  • contains no built-in punishment of early actors, companies that have already begun mitigating their emissions.

Not the most ambitious of demands, but there they are.