Mr Weisman's conclusion was backed up earlier this year by a study published in the Public Library of Science by Holly Jones and Oswald Schmitz, of Yale's School of Forestry and Environmental Studies.

韦斯曼先生的结论在今年的早些时候得到了支持，那是一份霍利·琼斯和奥斯瓦尔德·施密茨发表在耶鲁大学森林与环境研究系的科学公共图书馆的研究。

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The School of Drama, School of Forestry and Environmental Studies, and Divinity School are also well-regarded graduate programs.

戏剧学院、森林学和环境研究院以及神学院也是颇值考虑的研究生课程。

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Yupu Zhao is a Master of Environmental Science candidate at the Yale School of Forestry and Environmental Studies.

赵玉璞，耶鲁大学林业与环境研究学院环境科学硕士生。

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However, Dr Day from the School of Environmental Studies at the University of Ulster, Coleraine, told BBC News Online that horticulturalists and gardeners in Northern Ireland should not panic... just yet.

BBC: NEWS | UK | Northern Ireland | Hunt on for 'deadly ladybird'

Even so, there is a limit to how much voluntary action can achieve, says James Speth, dean of Yale's School of Forestry and Environmental Studies.

ECONOMIST: Companies as activists