For the last year, West Coast shipping news has been dominated by the huge assortment of container ships waiting to unload Asian imports in southern California, but the spotlight may eventually turn to a very different cargo—American wheat for export. This vital commodity rarely attracts much attention, but the hostilities between Russia and Ukraine are expected to reduce the world grain supply significantly this year. The USA and Canada each supply around 14% of the wheat on the world market in a typical year, while Russia exports 18% and Ukraine 8%. The loss of any of this grain could have…