It is a foot print symbol used now to indicate the increase in the amount of carbon dioxide and monoxide in the atmosphere 
1 1 1
Comment has been deleted
The term “carbon footprint” refers to the amount of carbon (C02) we emit individually in any one-year period. C02 is produced from many sources and is the primary gas responsible for Global warming and the resulting alarming changes in our climate. -
the amount of carbon dioxide released into the atmosphere as a result of the activities of a particular individual, organization, or community.....

1 5 1