Philip seddon , of the university of otago in new zealand , said that although most tourist projects conformed to basic guidelines on land use and not scaring wildlife , their full impact was rarely considered “许多生态旅游项目未经审查，也未经授权，仅微妙暗示其以环境友好之政策及行为为基础。 ”
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" in our study , people who ate spinach or collard greens two to four times a week had half the estimated risk of macular degeneration compared with those who ate them less than once a month , " says johanna seddon of harvard medical school 哈佛医学院的乔亚娜西登指出：我们的研究显示，每周吃二次到四次菠菜或芥蓝菜的人其罹患黄斑退化症的比例是每月吃这类食物少于一次的人的一半。
