Achieving sustainability through Distance Matters is a core value for CalCIMA members. Construction materials that build California's roads, mass transit, single family homes and high-density smart growth—all depend on large quantities of construction aggregates (sand and gravel) transported to job sites by heavy-duty trucks. California's infrastructure projects have a carbon footprint. Reducing the distances these trucks travel is a key strategy in reducing greenhouse gases and reducing the state's carbon footprint. CalCIMA created DistanceMatters.org in support of reducing carbon emissions by thinking globally and acting locally.