as more of our shopping has shifted online the global supply chains we rely on for deliveries have become increasingly stretched. that means from the us to europe to asia the world is running out of warehouse space. our asia business correspondent mariko oi has been investigating. three stories high and as big as seven football fields. this is the new hot property in real estate. we are inside the beating heart of one of singapore s biggest online grocers. tens of thousands of orders flow through this space every week which sits near the border with malaysia, one of the countries main suppliers. everything in this facility, more than 100,000 products at any one time is gone within three days. automation he does not mean that people have been replaced by robots. what it