I am in favor for more environmental friendly buses but based on
current technologies, cost of operations and avaliability of
infrastructure, it will still need to take another 5 to 10 years
more before we can really see them.
Even on the current hybrid car technologies, there are still
many teething problems for hybrid technologies and the cost of
manufacture, operating is still higher than conventional petrol and
diesel cars. Moreover unlike other countries, Singapore government
only talk and talk about caring for the environment but actions on
incentives to bring in such vehicles seems to be slow, slow
introduction of such cars, inadequate tax incentives and
infrastructure, etc. Even Frisker cars, manufacturer of electric
cars, which wanted to sell full electric cars here by this year
hits the speed bump. The relevant local authorities gave a very
lame excuse that the technology is currently still not suitable
here or something like that.
However bio diesel will be another better alternative as it is
as cheap as petrol and diesel, doesn't require much changes to
current engine technologies, easily obtainable (from used cooking
oil and hence recyclable too, and through growing of plants which
provide bio fuel), and most importantly, much lower emissions than
conventional fuels. However the technologies of refining bio diesel
needs to be further improved to reach the efficiency standards of
diesel.