Interior Department scientists define climate change projection limits

A new report from the U.S. Geological Survey—the indispensable source of portland cement, crushed stone and sand & gravel shipment data—stresses the need to factor uncertainties attending climate change predictions, especially as models link present greenhouse gas emission levels to earth temperature trajectories through the year 2100.

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Vulcan, Martin Marietta, Oldcastle remain top guns in aggregates output

Source: U.S. Geological Survey

The ranking of the top 10 construction aggregates producers remained the same from 2011 to 2012-the most recent year for which consolidated USGS data is available-except the nine and 10 positions, where the operators switched from the previous year’s spots.

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