Solar power is the obvious choice. A recent study showed that electricity from photovoltaic (PV) sources (roof panels) was something like 30 times more efficient than biofuel. (Photosynthesis captures 1% of solar energy; photovoltaic panels capture 10% and this figure gets better all the time.)
Source link below.
Oil shale and tar sands
There are lots of potential energy sources; some of them include solar energy, wind energy, nuclear energy, and many others more.
Solar and wind renewable energy, of course. Oil shale and tar sands
Renewable energy (solar, wind, water, hydro, tidal and wave, geothermal, ocean thermal, biomass, biofuel and hydrogen).
Yes there is allot of energy in petroleum. However it is a non renewable resource.
Limited resource such as petroleum and coal, once used then it is gone.
Petroleum
For a while, yes. Long term, no. It is a non-renewable resource, and so we have to switch over to alternative energy sources.
because it cannot be replenished when use up.
All the traffic on our roads relies on petroleum at present, and many many products are made from petroleum, so our whole industrial economy depends on it.
Petroleum is the most important energy resource in North Africa
Much of the energy we use nowadays (as of 2016) is from the so-called non-renewable sources - mainly coal, and petroleum.