The billionaire says he wants President Trump to change his mind about pulling out of the Paris agreement.
EPA Administrator Scott Pruitt risked running afoul of the Hatch Act by attending an Oklahoma Republican Party fundraiser.
A meeting that was to help determine whether the U.S. should withdraw from the Paris climate accord has been postponed, a White House official said.
Billionaire investor Carl Icahn's oil refining company, CVR Energy, made a massive bet in 2016 that prices for U.S. government biofuels credits would fall.
EPA chief Scott Pruitt blames regulations for the coal's industry's decline and downplays market forces.
President Donald Trump's administration denied a petition by environmental groups that sought to ban a common pesticide used on crops.
The Environmental Protection Agency will take a less aggressive approach to carbon dioxide emissions than in the past, Scott Pruitt said on Tuesday.
President Donald Trump signed an executive order on Tuesday to rescind key parts of Barack Obama's efforts to fight climate change.
Climate change science hasn't proven that carbon dioxide is the primary contributor, Southern Company chief Tom Fanning tells CNBC.
Since Trump was elected with help from Icahn's $200,000 in contributions to Republican causes, CVR energy's stock has gone up. The New York Times reports.
President Donald Trump will sign an order on Tuesday aimed at making it easier for companies to produce energy in the U.S., administration officials said.
British physicist Stephen Hawking fears he won't be welcome in the U.S. due to his criticism of how President Trump is treating scientists.
Scott Pruitt said last week that he doesn't believe carbon dioxide is a "primary contributor" to global warming.
Americans should expect to see major infrastructure improvements, longtime Trump friend and fellow real estate mogul Richard LeFrak says.
EPA Administrator Scott Pruitt faced blowback after he said carbon dioxide is not a primary contributor to climate change.
Scott Pruitt says precisely measuring human activity on the climate is challenging.
We can be both pro-growth, pro-jobs and pro-environment, says Scott Pruitt, EPA administrator, discussing the agency's new agenda and plans to roll back regulations and tackle fuel standards.
New reports show Scott Pruitt, now the EPA administrator, had close ties with oil and gas producers to reduce environmental regulations. NYT reports.
CNBC's Kayla Tausche reports the latest on newly-confirmed EPA Administrator Scott Pruitt and his first speech to EPA employees.
Here are some of the key stories CNBC is following this hour.