Synergetic effects in the co-pyrolysis of lignocellulosic biomass and plastic waste for renewable fuels and chemicals

•The synergetic effects in the co-pyrolysis of biomass and plastics were discussed.•The mechanism in the co-pyrolysis process with/without catalysts were revealed.•The products and CO2 emission in the co-pyrolysis process were summarized.•The challenges and future direction in co-pyrolysis process were pointed out.