Sorry, I gotta draw my line here. Maple decline as seen in parts of upstate NY, Vermont and New Hampshire has nothing to do with global warming. Maple decline is not the result one thing or event, but is a disease complex with many predisposing a-biotic and biotic factor leading to the death of the tree. Sulfur dioxide fallout from Midwestern and Canadian coal burning plants damage tissue weakening the tree lowers the PH in the soil binding up essential Micronutrients like Ca and Mg and others used in chlorophyll production and in host defense metabolites. Also the death of certain beneficial micro flora in naturally supportive soils has lead to a pathogenic soil in which low level root degraders reduce the absorptive root biomass further inhibiting the host ability to gather essential nutrients and water. There’s more to it but I think you get the picture.