A farmer packs harvested rice into a sack near a paddy field in Ngoc Nu village, outside Hanoi June 10, 2011. Saring food prices, civil unrest and worries about weather have spurred a global race to create more productive crops that can thrive in a warmer - and more prosperous - world. To match Special Report CLIMATE-CROPS/ REUTERS/Kham (VIETNAM - Tags: AGRICULTURE FOOD ENVIRONMENT)