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Q: We have a large tree-form lilac that needs to be trimmed back quite significantly. I can’t trim very far before I cut off a lot of leaves. What’s the best way to do this? Should I be concerned that ...

CAMDEN - Their little hands wrapped around the handles of kid-sized shovels, the boys and girls of Camden Day Nursery did their best to move dirt around a newly planted linden tree Friday.

The cooling effect of pollution may have been exaggerated. Fossil fuel burning spews sulfuric acid into the air, where it can form airborne particles that seed clouds and cool Earth’s climate. But ...