Cotton to coal: 10 commodities on a wild ride

6 of 10

Copper

Copper

Year-to-date change: 0.4%

Weakness in copper is not a good sign for global growth. Copper stockpiles tallied by the London Metal Exchange are at the highest level since August 2010, while inventories monitored by the Shanghai Futures Exchange recently jumped to a nine-month high of 161,062 tons.

Last updated February 28 2011: 7:24 AM ET

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