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Parmi les points faibles figurent les suivants : les chevauchements des comp étences et les limites mal définies des domaines de responsabilité, la nécessité d'établir des conventions intermunicipales pour gérer les ressources communes aux différentes instances, le fait de compter sur la mise en œuvre volontaire de certaines activités clés, la restructuration des institutions, l'accès à des financements et à des expertises limités, en particulier dans les zones rurales, une répartition inégale des ressources, et le manque de compétences en ce qui a trait à l'impact du changement climatique sur les infrastructures bâties et les technologies d'adaptation disponibles (Ivey
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Ontario's ecosystems are currently stressed by the combined influence of climate, human activities, movement of indigenous and non-indigenous species, and such natural disturbances as fire and outbreaks of insects and disease. Wetlands are particularly sensitive to changes in climate and other factors, and have experienced dramatic declines in recent years, especially in the south subregion of Ontario. Warmer winters, longer summers and associated changes in the mean average temperature have led to lower Great Lakes water levels, warmer water temperatures and reduced available soil moisture in forests and on agricultural land. Examples of impacts already occurring include observed changes in fish dominance from cold- and cool-water species to warm-water species in the south subregion; changes in the compositions of aquatic and terrestrial ecosystems in the north subregion; and reduced numbers and health of polar bears and seals . Further reductions in Great Lakes water levels as a result of climate change will further compromise wetlands that presently maintain shoreline integrity, reduce erosion, filter contaminants, absorb excess storm water, and provide important habitat for fish and wildlife. The number and populations of invasive species in the Great Lakes are likely to increase.
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