Eco-travellers have to prevent or minimize any negative impacts on the environment.
Eco-travellers are not required to protect the environment.Eco-travellers are encouraged not to have any negative impacts on the environment.It is eco-travellers' responsibility to prevent or minimize any negative impacts on the environment.Eco-travellers have never had any negative impacts on the environment.Hướng dẫn giải:Dịch: Du lịch sinh thái phải ngăn ngừa hoặc giảm thiểu mọi tác động tiêu cực đến môi trường.
