| 1 | Climate change threatens food crops across the world. | |
| 2 | So is the use of food crops to produce biofuels. | |
| 3 | Using food crops to make fuel was a major point of debate. | |
| 4 | Prices for rice, the main food crop, have doubled in Bangladesh in the past year. | |
| 5 | For instance, some researchers previously looked at introducing the hardiness of weeds into food crops. |