When Dr Balch, who is based at Woods Hole Research Centre, in Massachusetts, and her 30 helpers have finished their weeklong task, 50 hectares will have been torched.

• 鲍尔奇博士属于马萨诸塞州的伍兹霍尔研究中心，当她和30名助手结束为期一个星期的任务时，50公顷的雨林将付之一炬。