An abundance of fossil fuels combined with advances in technology to harness wind and solar power has sent energy prices crashing around the world. WSJ explains how it all happened at once. Photo illustration: Carlos Waters/WSJ Winter’s approach and a lot of working from home have lifted natural-gas prices to more than double their summer lows. More-expensive gas could sting consumers hunkering down for a winter in home officesand virtual classrooms. The U.S. Energy Information Administration estimates that average daily gas consumption will be 5% more this winter than last due to colder temperatures and people burning more than usual to heat and power their homes. But…