| http://www.w3.org/ns/prov#value | - While the cost of building electric cars is bound to come down as the technology matures, critics point out that many of the materials needed to produce electric cars, including lithium and rare earth metals, are actually far less abundant than oil. ???We???re at the very pioneering stage of this,??? Krebs says. ???We???re just getting electric vehicles out on the roads and we don???t know what co
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