Nrog rau kev loj hlob sai ntawm industrialization, qhov teeb meem ntawm kev siv hluav taws xob tau dhau los ua qhov tseem ceeb, ua rau muaj kev kub ntxhov rau ib puag ncig. Tawm tsam qhov keeb kwm yav dhau los no, kev siv tshuab hluav taws xob hauv tshuab hluav taws xob, nrog nws cov kev ua haujlwm siab thiab kev txuag hluav taws xob, tau dhau los ua lub zog tseem ceeb hauv kev txhawb nqa kev lag luam ntsuab.