Sex selection became a tool in a wider battle to stop " overpopulation " .
性别选择在阻止更广泛的“人口过剩”的斗争中成了一项工具。
An increase in crime is one of the by-products of overpopulation .
犯罪的增加是人口过多的副产品之一。
" Rather than spending millions of dollars on developing a technology with no redeeming social purpose , those resources could be aimed at reducing pet overpopulation . " Pacelle said .
