To see the impact of record-breaking temperatures around the world, watch wheat. Found in everything from bread to noodles, biscuits to cereals, beer to cakes -- there is no more widely grown staple crop and more than 170 million metric tons trade every year. So when the weather ruins harvests in one spot, it can shock markets and economies that are thousands of miles away. Charlie Pellet speaks to Agnieszka De Sousa about what current global temperatures are doing to crops, and your pocketbook.