According to a recently published paper in the peer-reviewed Proceedings of the National Academy of Sciences, wildfires in the western United States are currently at a 3, 000-year low.

FORBES: Yes, Reggie, This Is What Global Warming Looks Like

Among the largest underlying components of PWC, in trading today Western Digital Corp. ( NASD: WDC) is up about 0.3%, Computer Sciences Corp. ( NYSE: CSC) is up about 0.1%, and Seagate Technology Plc ( NASD: STX) is higher by about 0.5%.

FORBES: PWC, WDC, CSC, STX: ETF Inflow Alert