SHANGHAI, Apr 21(SMM) - Tesla CEO Elon Musk has publicly called for greater investment in lithium mining to fill the huge supply-demand gap created by the popularity of electric vehicles. He said battery production, more specifically lithium, is the "fundamental limiting factor" in the adoption of electric vehicles globally, "We need to help the industry in this regard, and I would certainly encourage entrepreneurs who are looking for opportunities to get into the lithium industry. Lithium’s profits are now almost equal to software profits.”