id	keyword
ajceb-5544	carbon
ajceb-5544	construction
ajceb-5544	productivity
ajceb-5544	energy
ajceb-5544	industry
ajceb-5544	carbon productivity
ajceb-5544	liu
ajceb-5544	changes
ajceb-5544	construction industry
ajceb-5544	intensity
ajceb-5544	decomposition