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Tag: sand

Soy and Dry Ice Among San Francisco’s New Tricks to Banish City Graffiti

KQED Science | November 14, 2013 | 0 Comments

Soy and Dry Ice Among San Francisco’s New Tricks to Banish City Graffiti

San Francisco cleans up a lot of graffiti every year. In the past, the city has used standard industrial solvents for this task, but now, workers will be cleaning up with non-toxic materials, in an effort to protect people and reduce toxic runoff.

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California’s Looming Sand-and-Gravel Crunch

KQED Science | June 6, 2013 | 0 Comments

California’s Looming Sand-and-Gravel Crunch

A new map of sand and gravel resources from government geologists is alerting us that California cities and regions must keep thinking locally to keep prospering.

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