I'm just as inquisitive to the tech you are using as everyone else reading these posts. Material handling- plant hire equipment is behind on some aspects of the automotive- commercial vehicle industry there are various fuels being tested with a Catalyst to lower emissions Selective Catalytic Reduction (SCR) - plus stop start technology with hybrids.
Ic engines - can still be viable with the right technology and fuels, electric vehicles have their place in the market and possible brake through with solid-state batteries or the use of super capacitors to reduce load / drain on larger battery configurations under power..