In the EU the waste hierarchy is adhered to as a standard for the correct treatment of waste (EU Directive 2008/98/EC from 19th November 2008)
When you apply the waste hierarchy classifications to the disposal methods of ELTs the best environmental solution is to retread the tyres. The second best option is to recycle the tyres e.g. using BANREC technology. The next best solution is incineration/combustion in cement kilns also called energy recovery. The worst option is to landfill the tyres. Fortunately, that has been banned in many countries.