We all know about the truth of economy what we have almost never done because of either disremembrance or the thinking that the waste is too little to care.

• 燃煤排放实际和火山喷发物硫酸盐、硝酸盐、二氧化碳无异，他们使一类植被退入土壤，以提供其他农作物生长的环境。