Greenhouse gas emissions, and CO2, the most important of these, are a major long-term concern in the world. Today, significant investments are being made in the decarbonization of the economy, i.e. to drastically reduce these emissions. Along these lines, which sector of the economy emits the most CO2 in relation to the dollar revenues it generates?

ANSWER 

Utilities. This sector generates 2,634 tons of CO2 per US$1 million in revenues. It is followed by materials (918 tons per US$1 million invoiced) and energy (571 tons).