Crude oil prices have fallen for four consecutive days, reaching their lowest levels in four years due to recession fears and a deepening global trade war. US tariffs on China, the largest oil importer, have led to significant drops in Brent and WTI crude prices. Analysts predict a further decline in oil demand and economic growth in China, while OPEC members are unwinding production cuts. The US Energy Information Administration has delayed its report amid these developments, and Goldman Sachs has lowered its Brent forecast. Other commodities like copper and iron ore have also seen declines, impacting mining stocks globally.