Waste Management, Inc. is a holding company, which engages in the provision of waste management environmental services. The company is headquartered in Houston, Texas and currently employs 61,700 full-time employees. The firm provides collection, recycling, and disposal services to millions of residential, commercial, industrial, and municipal customers throughout the United States and Canada. Its segments include East Tier, West Tier, Recycling Processing and Sales, WM Renewable Energy, and WM Healthcare Solutions. East Tier primarily consists of geographic areas located in the Eastern U.S., the Great Lakes region and all of Canada. The West Tier primarily includes geographic areas located in the Western U.S., including the upper Midwest region and British Columbia, Canada. Recycling Processing and Sales includes the processing and sales of materials collected from residential, commercial, and industrial customers. WM Renewable Energy develops, operates, and promotes projects for the beneficial use of landfill gas. WM Healthcare Solutions includes Regulated Waste and Compliance Services and Secure Information Destruction services.