article_snippet: Considering that two-thirds of the U.S. federal government .
article_snippet: face legal challenges.
article_snippet: On April 16, a federal appeals court in .
article_snippet: Washington, D.C. will hear arguments from 13 states opposed to . as-yet-unfinalized regulations from the Environmental Protection .
article_snippet: Holmstead calculates that at least five high court .
article_snippet: justices are wary of EPAEPA's regulatory leeway.
article_snippet: modified by legal challenges, David Waskow, director of international initiatives for the are rarely overturned.'