Dozens of new electric-vehicle models are expected to arrive at dealerships in the next few years. We followed eight Wall Street Journal reporters in four countries to see if they, and the world, are ready to make the switch. Nikola Corp. said Monday it secured an order for 2,500 electric garbage trucks from refuse giant Republic Services Inc., with the announcement coming less than a week after analysts complained about a lack of clarity on the business plan and order bank. The electric-vehicle company has for several years touted robust interest in the electric and fuel-cell trucks it plans to mass produce and sell. Last week, Nikola published its first earnings report since going public in June, losing $86 million while pulling in essentially…