Pongamia, an unassuming medium-sized tree, is gaining prominence because its large brown seeds produce oil that can be used to run generators and farm equipment.

• 不算高大的水黄皮树貌不惊人，但它正日益受到关注，因为它硕大的褐色种子能够榨油，用来驱动发电机和农用设备。