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 Saudi Arabia is considering canceling OPEC plans for an oil output hike early next year, senior Saudi oil advisers said, as Covid-19 cases in many parts of the world rise and the expected return of Libyan crude threatens to swell global supplies. In April, the 13-member, Saudi-led Organization of the Petroleum Exporting Countries and 10 Russia-led producers agreed to carry out record production cuts of 9.7 million barrels a day, as the initial flare-up of the new coronavirus shuttered economies around the world, grounding…