Carbon tax, carbon footprint.

A Carbon footprint "the total set of greenhouse gas (GHG) emissions caused by an organization, event, product or person."

Abbott stars at anti-carbon tax rally

http://www.smh.com.au/environment/climate-change/abbott-stars-at-anticarbon-tax-rally-20110816-1ivwu.html

Abbott cheered on at anti-carbon tax rally

http://www.abc.net.au/news/2011-08-16/abbott-carbon-tax-rally/2841706/?site=sydney