H. J. RES. 177 is a joint resolution expressing congressional disapproval of a specific rule set by the Environmental Protection Agency. This rule involves standards and guidelines for greenhouse gas emissions from various fossil fuel-fired electric generating units, as well...
Simple Explanation
H. J. RES. 177 is about Congress saying "no" to a rule by the Environmental Protection Agency (EPA) that tries to reduce pollution from power plants, but it doesn't offer any new ideas for how to handle the pollution instead.