National Public Radio: RENEE MONTAGNE, host: And there’s a hardy bush that’s been hailed as a great biofuel crop. Jatropha curcas is said to survive in harsh conditions and needs little care. Proponents predict a future in which jatropha oil will power commercial jets and cars. But in one place where the government has encouraged farmers to plant the bush, things aren’t going so well. Nick Wadhams visited a drought-stricken area in Kenya. Unidentified Man: (Foreign language spoken) NICK …