Recreational tree climbing is an evolving sport. It got its start in 1983, when Peter Jenkins began teaching all sorts of people, including children, how to climb trees safely using a rope and a harness and the recreational tree climbing technique. In the United States, it is now practiced by a thousand or so people but is rapidly growing in popularity. However, those who study rare plants are worried about recreational tree climbers. They fear that these climbers may try to climb the biggest and tallest trees if they learn their exact locations. Any contact between humans and rare plants can be disastrous for the plants.

① Peter Jenkins가 1983년에 가르치기 시작했다.

② 아동들도 안전하게 오르는 법을 교육받았다.

③ 미국에서 빠른 속도로 인기를 얻어가고 있다.

④ 희귀 식물을 연구하는 사람들이 적극적으로 즐긴다.

⑤ 사람과 희귀 식물의 접촉은 식물에게 해가 될 수 있다.