Trees are humankind's best friends. They remove carbon dioxide from the atmosphere via photosynthesis, store it as cellulose in their trunks, branches, leaves and roots, and release oxygen back into the air as a byproduct. They also cool our cities and homes and reduce energy usage. Pines and other evergreens planted on the north side of a home serve as a wind block during cold months. Deciduous trees planted on the south side provide shade in the summer but don't block out light in winter.
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