Exxon Mobil Corp., Chevron Corp. and ConocoPhillips had their credit ratings lowered after S&P Global Ratings followed through on its recent warning and revised the industry’s risk profile due to climate change and weak earnings.

Exxon Mobil Corp. released emissions data on customers’ use of its petroleum products for the first time after coming under pressure from investors.

Exxon Mobil Corp. warned it may take up to $30 billion in writedowns on natural gas fields as crashing energy demand and prices spurred a historic losing streak.

America’s oil production will never again reach the record 13 million barrels a day set earlier this year, just before the pandemic devastated global demand, according to Occidental Petroleum Corp.

Chevron Corp. overtook Exxon Mobil Corp. as the largest oil company in America by market value, the first time the Texas-based giant has been dethroned since it began as Standard Oil more than a century ago.

Occidental Petroleum Corp. will have just a single oil rig in the Permian Basin in the second half of the year, illustrating the scale of the shale industry’s pullback and the company’s debt woes.