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NAMTA Journal 31/2 11 Earth Systems and Human History

Sequence 7 Million Tons 7,000 ------------------ Source: ORNL, BP 6,000 5,000 4,000 3,000 2,000 1,000 1950 1960 1970 1980…

Sequence 8 Degrees Celsius 14.8------------------ 14.6 14.4 14.2 14.0 13.8 13.6 13.4 Souru: G<>ddard Institute (…

The NAMTA Journal, Volume 31, Number 2, 2006, Spring

Sequence 175 Million Tons 7,000 ------------------ Source: ORNL, BP 6,000 5,000 4,000 3,000 2,000 1,000 1950 1960 1970 1980…

Sequence 176 Degrees Celsius 14.8------------------ 14.6 14.4 14.2 14.0 13.8 13.6 13.4 Souru: G<>ddard Institute (…