At Greece's largest coal mine, controlled explosions and the roar of giant excavators scooping up blasted rock have once again become routine. Coal production has been ramped up at the site near the northern Greek city of Kozani as the war in Ukraine forced many European nations to rethink their energy supplies. Coal, long treated as a legacy fuel in Europe, is now helping the continent safeguard its power supply and cope with the dramatic rise in natural gas prices caused by the war. Electricity generated by coal in the European Union jumped by 19% in the fourth quarter of...