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Central Intelligence Agency -- World Factbook has basic facts about the countries of the world.
Here's a link to the entry for the United States. I'll omit statistics included there.
Thus most sons of farmers and farm workers did not become farmers. At the same time, agricultural production increased greatly, and the U.S. remained the world's largest agricultural exporter. From the point of view of an individual farmer, this was often disappointing, but this reduction in agricultural labor permitted increases in employment in other activities, thus increasing the standard of living. The good side of this for farmers is illustrated by this 1921 advertisement from Successful Farming Magazine.
This table of carbon emissions in tonnes (metric tons) came from Nature, 1997 July 17, p.213, which got it from a report issued by the London based World Energy Council.
At the end of 1996, world emissions of carbon were 6.5 billion tonnes. These included 2.4 billion tonnes from coal, 2.8 billion tonnes from oil and 1.3 billion tonnes from natural gas.
My impression of these statistics is that the year-to-year changes in carbon emission are more a reflection of the activity of a country's economy than of changes in technology or government policy.
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