Chalk,the main ingredient,is abundant (and cheap) on every continent in the world. Much lies on or near the surface; mining it uses much less energy than syntheizing plastics,as well as those other packaging staples,paper and cardboard.

• 新材料的主要成分白垩在世界上的每个大洲都很丰富(并且便宜)，而且大量存在于地表及浅地层，开采起来比合成塑料及其他包装材料，如纸和溥纸板节省能源很多。