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Hunt, ENSR, Acton, Massachusetts, USA Water Quality Research B1 Influence of the Zebra Mussel 8 (Dreissena polymorpha) on Water Quality of Lake Erie; J. Mc Farland, Imperial Oil Limited 36 P6 Global Warming: What's Known and 37 What's Not? Yang, Ontario Cabinet Office I I I I VOLUME I SESSION A: AIR QUALITY RESEARCH Verbal Presentations Page A2 Genetic Characteristics of Healthy 38 and Declining Sugar Maple (Acer saccharum Marsh) in Ontario; P. Imperial's initiatives to generate a broader understanding of the scientific and economic implications for Canada and Imperial are discussed, J, D- Hc Farland/wl October 5, 1990 I I I I I I I I I I I I I I I M Global Harming: What's Known and What's Not? Utilizing the results of chemical analyses and available toxicological information, guidelines which were termed "Concentrations Considered Excessive" were developed for a number of contaminants in soil and plant foliage.