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Readers respond to a Sunday Review article, “Leaving Only Footsteps? Think Again.” 本文是对《户外运动打破了大自然的宁静》（2017年2月17日）一文的回应。 To the Editor: 致编辑： “Leaving Only Footsteps? Think Again,” by Christopher Solomon (Sunday Review, Feb. 15), is a reminder that we humans affect the natural world even when we think that we don’t. But two caveats. 克里斯托弗·所罗门的《户外运动打破了大自然的宁静》提醒我们：人类在自身没有察觉的情况下也仍可能对自然界产生影响。不过有两点需要说明。 First, even if a hiker or a skier frightens wildlife more than a passing snow machine, the machine probably still has more effect. Why? Because motor vehicles travel many times farther on an average trip, and thus affect much more habitat compared with those traveling under their own power. 首先，即便一位徒步者或滑雪者给野生动物带来的惊吓多过一辆行驶的雪地摩托车，摩托车也仍可能产生更多的影响。为什么呢？摩托车的平均单次活动距离比人多出许多倍。因此，相比于那些仅凭自身力量的人，摩托车会影响更多的动物栖息地。 Second, conservationists have rightly focused on the damage caused by mines and logging in the backcountry not only because such projects directly destroy habitat, but also because they inevitably require new roads. For example, a recently proposed coal mine expansion on national forest in Colorado would require six miles of new road in roadless habitat that is home to black bear, elk and lynx. Such roads not only slice and dice habitat, but they also extend human effects, including recreational travel of all kinds, while also creating vectors for invasive species and more frequent wildfires. | 
