Nickel developers and producers are working to be more environmentally sensitive for the electric vehicle industry, which experts say may not increase demand into a significant share of an already oversupplied market for up to a decade. Environmental, social and governance issues have already cast a shadow over the Sept. 22 annual shareholder meeting of Tesla Inc., whose CEO, Elon Musk, lit up nickel markets in July when he offered a "giant" long-term contract to companies that could mine it in an "environmentally sensitive way."