id	keyword
cet-15027	pet
cet-15027	food
cet-15027	sustainability
cet-15027	environmental
cet-15027	waste
cet-15027	doi
cet-15027	production
cet-15027	impact
cet-15027	industry
cet-15027	materials
cet-15027	market
cet-15027	research
cet-15027	manufacturers