The cartoon, no doubt, aims at alarming humans of the heavy load we have exerted on Earth by our insatiable production and usage of automobiles.
毫无疑问，这幅漫画意在向人们敲响警钟，即人类永不知足的生产和使用汽车给我们的地球带来了巨大的负担。
2
Though a footprint can be positive or negative, the emphasis in these considerations is such that a person is seen primarily as a threat or load to the earth.
虽然这种足迹可好可坏，这些考虑重点在于人类从根本上给地球带来多少威胁和负担。
3
The severe air pollution alarms humans of the heavy load we have exerted on Earth by our insatiable production and usage of automobiles.