The massive rollout of clean energy solutions will need as much as $10 trillion of investments over the next 20 years, but continued use of fossil fuels will cost even higher, $14 trillion, Tesla said in a presentation on Thursday. In addition to initial capex, 5% per year maintenance capex with a 20-year horizon is included in the investment estimate to reach sustainable energy for the world, Elon Musk’s EV maker said in the Master Plan Sustainable Energy for All of Earth report. “Using these assumptions, building the manufacturing…