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Weeks later, the Army Corps of Engineers had tagged the trees for removal, but certified arborists had inspected them as a second opinion and deemed them healthy.

Walter Warriner, a Santa Monica arborist, told The Times a lot of trees had had their roots cut for sidewalk and street repairs, eliminating anchors to hold them down during exceedingly strong winds.

He studied ecology at the University of Aberdeen before becoming an arborist.

The program doesn’t just beautify treeless neighborhoods, said arborist Carlos Campero, executive director of the City Plants program; it also reduces energy use.

Ever the stewards, just as they’d discussed with Frank on day one, the Martinezes have had three arborists treat the maples for bark beetles and bacteria in the soil.