(CNN) -- The Supreme Court tried mightily to wade through a cloud of bureaucratic regulations Monday over setting clear air standards, a high-stakes environmental and economic fight pitting the Obama administration against a coalition of states and utilities. The justices on Monday heard six separate appeals, which were consolidated into more than 100 minutes of often dense oral arguments. A ruling is expected by June. At issue is narrow, but potentially far-reaching -- whether the Environmental Protection Agency can tighten emissions standards for "stationary" greenhouse gas sources, such as power plants, in what the administration says is an effort to stem the effects of climate change and global warming.
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Supreme Court hears six appeals during oral arguments
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Federal clean air standards at issue for states and utilities
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Cases could be a major test of executive authority for the White House
Some progressive groups worry the conservative majority @placeholder has been overly friendly to corporate interests in recent years, and could rule in this case against the administration.