Sip : tbumi
Kebutuhan nikel akan membaik di 2010 dan naik 7%. http://www.telegraph.co.uk/finance/personalfinance/7044775/Which-metals-\ will-outshine-gold.html <http://www.telegraph.co.uk/finance/personalfinance/7044775/Which-metals\ -will-outshine-gold.html> Kebutuhan batubara juga meningkat di 2010 http://www.iea.org/work/2003/beijing/4Youg.pdf <http://www.iea.org/work/2003/beijing/4Youg.pdf>
