id	keyword
cet-12769	hydrogen
cet-12769	energy
cet-12769	economy
cet-12769	waste
cet-12769	production
cet-12769	green
cet-12769	cost
cet-12769	fuels
cet-12769	challenges
cet-12769	fossil
cet-12769	carbon
cet-12769	hydrogen production
cet-12769	technology