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Chief Justice John Roberts could decide on a motion to halt the Obama administration's far-reaching climate rules as soon as this week, say lawyers familiar with the litigation.

Two motions to stay Obama's climate rules were sent to the Supreme Court last week, one from 29 states and another by dozens of utilities, large manufacturers and oil companies.

The climate plan, called the Clean Power Plan, is unprecedented in scope, which is why so many groups and states oppose it. The plan directs states to reduce greenhouse gas emissions a third by 2030, as part of a broader administration effort to combat manmade climate change. Many scientists say the emissions, primarily carbon dioxide from the burning of fossil fuels, are causing the Earth's climate to warm, resulting in more severe weather, longer droughts and more flooding.

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