Marriott International announced a broad strategy yesterday to reduce its impact on the environment, pledging $2 million to protect the Brazilian rain forest and promising that by the end of the year its guests will be able to offset greenhouse gas emissions from their hotel stays..."It's meaningful. It's unique. It's innovative," said Jeff Hayward, a verification services manager for the Rainforest Alliance, a New York advocacy group...Marriott's environmental efforts are being led by senior company executives on the business and public relations sides: Arne Sorenson, the chief financial officer, and Kathleen Matthews, head of global communications. Those executives are working with Conservation International...