id	keyword
ape-4246	energy
ape-4246	gas
ape-4246	oil
ape-4246	generation
ape-4246	power
ape-4246	electricity
ape-4246	sources
ape-4246	use
ape-4246	production
ape-4246	distribution
ape-4246	policy
ape-4246	economics
ape-4246	coal
ape-4246	world
ape-4246	climate