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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Sand & gravel-tracking agency cites future supply concerns
Construction aggregates production in 2014 reached an estimated 2.17 billion metric tons, valued at $19.8 billion and besting the prior year volume by more than 7 percent, according to the U.S. Geological Survey Mineral Commodity Summaries 2015 report.
Read MoreVulcan, 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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