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Dr Ruddiman argues, in Quaternary Science Reviews, that with vast tranches of land at their disposal and only unrefined agricultural techniques, early farmers had no incentive to maximise the potential of the land they farmed. Previous attempts to take into account the effects of early agriculture on the climate have assumed that people farming then used about the same amount of land to grow food, per person, that they did into the modern era. Dr Ruddiman argues that such an assumption is tantamount to suggesting that farmers have learned nothing in the past 5,000 years.
He and his colleagues have turned to archaeological and anthropological data to show that early farmers used ten times as much land per person as modern farmers. Burning off large areas of forest or grassland, they would farm the enriched soil until its yield began to drop, and then move off to do the same elsewhereas practitioners of slash-and-burn agriculture do to this day.
Such profligacy would make the contributions of early farmers large enough to have an effect on worldwide levels of greenhouse gases. So although the size of the effect has increased markedly since the industrial revolution, it looks as if humanity has been interfering with the climate since the dawn of civilisation.

A. 어휘
Quaternary 지질학상 제 4紀(기).
vast tranches of land 광대한 땅. at their disposal 자유롭게 처분할 수 있는.
unrefined 精製(정제)되지 않은, 세련되지 못한. maximise 극대화하다.
potential 잠재력, 가능성. Previous attempts 以前(이전)의 시도.
take into account 고려하다. assumption 假定(가정).
tantamount to 동등한. colleague 동료. archaeological 考古學的(고고학적).
anthropological 인류학적. yield 수확량, 생산량, 생산. practitioner 개업하는 사람.
slash 나무를 베다. practitioners of slash-and-burn agriculture 火田民(화전민).
profligacy 낭비, 방탕. contributions 공헌, 기부, 寄稿(기고).
markedly 두드러지게. interfere with 손상하다, 해치다, 간섭하다.
dawn 새벽.

B. 구문
- Such profligacy would make. . . worldwide levels of greenhouse gases.
[그러한 낭비는 농부들의 역할을 세계전체의 온실가스 수준에 영향을 끼칠 만큼 컸다는 것으로 부각시킨다.]