This booklet presents key messages for action, summarized from a set of chapters on different environmental health issues, available at www.who.int/ ceh/publications/healthyenvironmentsforhealthychildren. The work is a result of an on-going partnership between WHO, UNEP and UNICEF in the area of children’s environmental health, and seeks to update the 2002 joint publication “Children in the New Millennium: Environmental Impact on Health.”