In the context of which one of the following are the terms 'pyrolysis and plasma gasification' mentioned?
a
Extraction of rare earth elements
b
Natural gas extraction technologies
c
Hydrogen fuel-based automobiles
d
Waste-to-energy technologies
Environment & EcologyWaste Management Technologiespyrolysisplasma gasificationwaste-to-energysolid wasteenergy generationthermal treatment