US carmaker Tesla is to cut more than a tenth of its workforce worldwide, equivalent to an estimated 14,000 employees, according to an internal email from Tesla boss Elon Musk pointing to a slump in the market for EVs and weak sales worldwide. As part of efforts to cut costs and increase productivity, “we have done a thorough review of the organization and made the difficult decision to reduce our headcount by more than 10% globally,” Musk writes in the email seen by dpa. Tesla’s staff complement stood at more than 140,000 at the end of last year, according to its annual report. On Monday, top…