FORT MYERS, Fla. — What some see as the biofuel of the future starts out as short, thick stems with a few leaves sticking out at sharp angles. But in just a few years, they will be tall, leafy trees ...

Renewable energy, it turns out, does grow on trees. The fruit pods plucked from jatropha trees have seeds that produce clean-burning diesel fuel. But unlike corn and other biofuel sources, the ...