与此同时，由于化石燃料的使用和农业活动导致“温室”气体显著增加 — — 二氧化碳增加了30 % ， 甲烷增加了100 % 。
At the same time, of course, human consumption of fossil fuels, together with our agricultural activities, have caused substantial increases in concentrations of “greenhouse” gases – CO2 by 30% and methane by more than 100%.