Answer:
1. Electricity
2. Transportation
3. Industry
4. Commercial and Residential
5. Agriculture
Explanation:
The US has been the leading country for over 100 years when it comes to emissions of Greenhouse gases into the atmosphere, thus we can say that it has been the biggest contributor to it, along China in the past couple of decades. The emissions of these gases come from numerous sources, and they are divided into several categories. The production of electricity seems to be the biggest of them all. On the second place comes the transportation, and actually it is the one that is having the biggest rise over the years. The industry surprisingly comes on the third place, even though ti is the one mostly blamed for the majority of the emissions. At the bottom are the commercial and residential factors, and the agriculture trailing far behind the other three, but still have their fair share in it.
