Brazil’s worst drought in decades is decimating crops but breathing new life into battered commodity markets. It hardly has rained in some of the South American country’s top farming regions since the start of the year, a period when precipitation is usually the heaviest. Traders, analysts and government forecasters who were calling for record harvests in coffee, sugar and soybeans as recently as December are cutting production estimates, triggering a spike in futures prices that may translate into higher costs for consumers later in the year. Futures prices for the arabica coffee variety are up 67% since the start of the year. Raw-sugar prices have risen 8%. Soybeans, which have been affected by drought in some areas and too much rain in others, also are up 8%. The withered coffee trees and parched sugar-cane fields stand in contrast to the bumper crops that have weighed on commodities […]