Policy Analysis: Climate Change 1000words

Your task is to:

Briefly describe how a carbon tax works, discussing the recognized drawbacks and benefits, as well as explaining how it works: who pays, who benefits, why is it effective and efficient, why not;
Briefly describe how a Renewable Portfolio Standard works, discussing the recognized drawbacks and benefits, as well as explaining how it works: who pays, who benefits, why is it effective and efficient, why not;
Discuss which tool would be more politically feasible in the United States, and which would be better for climate change mitigation