environmentally harmful meaning in English

对环境有害的

Lignin composes about 15 ~ 36 % by dry weight in norway spruce wood and has to be removed in chemical pulping for the manufacture of high quality paper . a slight decrease of lignin in wood ' s is estimated to significantly reduce the consumption of environmentally harmful chemicals during chemical pulping
木质素的存在影响到纸浆和造纸的质量，所以在木材加工成纸浆的过程中，必须用大量的化学物质除去它，这样不但增加生产成本，而且在处理过程中会给环境造成很大的污染。