I never even mentioned biofuels — you’re trying to counter a point that nobody made.
Regarding efficiency, in a typical wind turbine, I think what you mean is about 45% of mechanical energy is converted to electricity — that’s due to limitations imposed by the laws of thermodynamics. And you’re aware that the efficiency of gas turbines ranges from just 30 to 60%? As for solar panels, you’re aware that plants only convert about 1% of the sunlight that falls on them into storable chemical energy? On the other hand, photovoltaic solar panels with efficiencies as high as 46% have been demonstrated.
And as for your final point, are you seriously asking why the world should move away from fossil fuels?