One of the world's biggest and most prestigious museums is cutting financial ties to the fossil fuel industry. The American Museum of Natural History (AMNH) on Monday said it had joined the global movement to divest from coal, oil and natural gas companies. The New York City institution said the move aligns with its longstanding efforts to help protect the fragile planet. "We hope we can achieve our collective goal of global sustainability while maximizing the resources each of our institutions brings to bear on this vital issue," Daniel Stoddard, AMNH's chief investment officer, wrote in a letter to environmental groups. The museum's announcement arrives as the worldwide divestment movement is gaining steam.