This document discusses the concept of a "green library," which aims to minimize negative environmental impacts through careful site selection, use of natural and sustainable materials, conservation of resources like water and energy, and recycling. It notes standards like LEED certification that can evaluate a library's sustainability. Benefits of green libraries include lower costs and maintenance needs, a healthier environment for users and staff, and playing a role in environmental conservation. Elements, challenges, and examples of green library buildings from around the world are provided. International organizations like IFLA and ALA support green library initiatives through awards, resources, and advocacy.