At least biodiesel is a renewable resource.... Petroleum is
not...
Also, the energy used to make biodiesel can be derived from clean
energy sources, like solar or wind power. But of course Singapore
is still ill-equipped when it comes to clean energy sources.
Perhaps the government should build solar panels on every buildings
since Singapore is so sunny. Or someone can invent a windmill which
has solar-cells on the propellers. Then the windmill can get energy
from the sun or wind. Haha.