Five years ago, city officials set a goal of planting 100,000 trees by the end of the decade, but they have fallen behind and are struggling just to keep pace with the high mortality of trees that have fallen victim to a spate of heavy storms, disease, and the regular urban onslaught of pollution, road salt, acidic soil, and reckless driving, among other perils. The city and supporting groups have planted only about 10 percent of the promised trees.
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