Explainer: What is cap-and-trade?
![power_plant_emissions1.jpg](https://s3.amazonaws.com/witfDotOrg/news/power_plant_emissions1.jpg)
Pennsylvania’s efforts to comply with the federal plan to curb power-plant emissions could be delayed by an amended fiscal code, critics say. (Emma Lee/WHYY)
(Undated) — Pennsylvania environmental regulators are studying a citizen-led petition to implement a cap-and-trade program in the state, with the goal of dramatically cutting climate-damaging greenhouse gas emissions.
So, how does cap-and-trade work?