ExxonMobil is facing questions about what it told the public and investors about the risk of climate change.

The state of New York is investigating the oil company. The case focuses on whether ExxonMobil failed to warn investors about climate change and its impact on the oil business.

An ExxonMobil spokesman rejected the charges that the company tried to change research. The oil company said it stands by its 40 years of climate research.

New York sent a subpoena to ExxonMobil that demands financial records, emails and other documents. The oil company is deciding how to respond, said a public affairs executive with ExxonMobil.

I'm Mario Ritter.

Jim Dresbach wrote this story for Learning English. Kathleen Struck was the editor.