In 1974, Lalonde had presented A New Perspective on the Health of Canadians to the public and the House of Commons. This Green Paper was intended to open discussion about the approach of Canadians to health. Using historical data to demonstrate how infectious diseases were no longer the main cause of preventable deaths, the document outlined the health field concept, a four-part analytical tool that pointed out that the environment, human biology and lifestyle were often as important in determining the health of Canadians as the health care system. This holistic approach challenged the traditional assumption that future improvements in health and longevity would result from further funding for improved technology, more medical personnel and more hospitals. Instead, A New Perspective argued that citizens and governments had to pay greater attention to health promotion, regulating air, water and soil pollution, dealing with poverty and lack of access to services for the mentally ill, Aboriginal peoples and rural Canadians, and making sure that the health care system functioned efficiently and effectively.