Solar and onshore wind power are now the cheapest new sources of electricity in at least two-thirds of the world’s population, further threatening the two fossil-fuel stalwarts — coal and natural gas. The levelized cost of electricity for onshore wind projects has fallen 9% to $44 a megawatt-hour since the second half of last year. Solar declined 4% to $50 a megawatt-hour, according to a report by BloombergNEF. The prices are even lower inn some countries including the U.S., China and Brazil. Equipment costs have come down, technologies have improved and governments across the world have boosted clean-power targets as they seek to combat climate change. That could squeeze out coal and natural gas when utilities develop new power plants.