Recently, the god of stock Warren Buffett is increasing investment in new energy vehicle industry chain upstream key material “lithium”. Occidental Petroleum Corporation (OXY.US) said it has established a joint venture with Berkshire Hathaway's (BRKa.US) energy sector, which will use its technology to extract high-purity lithium compounds and commercialize their production in Berkshire's geothermal facilities in California. The International Energy Agency forecasts that the world will face a nearly 50% shortfall in lithium demand by 2030, based on existing lithium production projects under construction. Geothermal brines, oil and gas field brines, seawater and other unconventional brine sources of lithium resources or become a new way to make up for that supply gap. Berkshire's energy arm, BHE Renewables, is known to operate 10 geothermal power plants in California's Imperial Valley that can process 50,000 gallons of lithium-rich brine per minute to produce 345 megawatts of clean energy. And TerraLithium, a wholly owned subsidiary of Occidental Petroleum, owns a patent for DLE technology that converts lithium-rich brine into high-purity lithium.