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%. Indeed, these concentrations are higher than at any point in the past 400 millennia, with more growth to follow, because so far these effects have largely been caused by only 25% of the world population.
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%。这些现象在过去40万年中都没有过。由于目前的现象还只是由25%的人口产生的，随着不断的发展，环境还将恶化。