From cdiac.ornl.gov/trends/emis/tre_coun.html the carbon dioxide emissions graph Ethiopia there is data to show that there is very little Co2 emissions until the mid to late 1960's. Through some research I thought that possibly this was due to the deforestation that occurred throughout that time. However, throughout the history of Ethiopia the majority of Co2 emissions was caused by liquid (fuel). During the 60's there was also political unrest in Ethiopia, however, I am not sure how that would affect Co2 levels.
Ethiopia is an undeveloped country and their Co2 use per capita follows that status. Ethiopia uses only .02 metric tons per person. Compared to the US that uses 4.9 metric tons of carbon per person. That is only .098% of the US usage. On the overall ranking of countries production of Co2, Ethiopia is 208th compare to the US at 12th. Knowing that the majority of the US's carbon production is from buildings (Residential, commercial, and industrial), it makes sense that Ethiopia, whose major contributing factor of GDP is agricultural, would be that much lower than the US and other developed countries.
As can be seen on the Carbon Emissions graph that has comparisons to five other countries (three of those are developed and two are not), Ethiopia's carbon emissions does not even register. As a country Ethiopia does not even get above 2000 metric tons of carbon emissions in a year. Compare that with the US at 1.5 million metric tons and China at 2.25 million metric tons. China is obviously the largest emitter of Carbon as of 2010. But overall the US per capita is a much larger Co2 emitter than China. At 4.71 metric tons per US citizen compared with 1.68 per Chinese citizen, it is pretty obvious that the US has much larger consumption levels than China.
It is even more obvious who the largest contributor to Co2 emissions is when comparing total overall Co2 emissions. The US is at 94,225,770 Thousand Metric tons of Co2 since the year 1900, China is at 36,152,061 since 1900, India is at 10,229,326, Italy is 5,576,526, and Ethiopia is at 38,686 since 1941 (farthest back their records go). It is obvious who is to blame for the most Co2 emissions thus far. China has only produced 38.3% of what the US has produced, and India has produced only 10.85%.