biodegradably-slow cheap chemical discardable disposable empty environmentally-unfriendly EPS expanded-polystyrene-foam foamed food-plate hazardous-waste inexpensive insulating lightweight low-cost monomer-styrene plastic plate pollutant pollution polystyrene PS substance synthetic-hydrocarbon-polymer toxic-waste unused widely-used 4WD-vehicles beach churn churned-up churning coast coastline colors colours conservation conserve conserving damage damaged damaging driving dug-up environment environmental four-wheel-drive marked marks ocean ocean-edge off-road off-road-driving prints protect protection rough safety sand soft-sand surface surfaced surfaces tire-tracks track tracks traction tyre-tracks vehicles vehicles-permitted wild activity curved curving foot-prints grainy gray grey impressed impressions imprinted imprints indented light over-printed patterns tangled terrain texture textured textures vehicle-tracks