id	keyword
brj-22968	carbon emissions
brj-22968	products industry
brj-22968	forest products
brj-22968	china
brj-22968	energy
brj-22968	development
brj-22968	curve
brj-22968	factors
brj-22968	output
brj-22968	value
brj-22968	intensity
brj-22968	forestry
brj-22968	kuznets