Reuters: A portion of the revenue from any U.S. system capping carbon emissions must go toward softening the impact of higher energy prices on consumers, a White House official said on Wednesday. Joseph Aldy, special assistant to the president for energy and the environment, said building a clean energy economy will not be easy. “There will be those who are going to be vulnerable as we make this transition and … we need to actually target the allowance value and revenues to those …