| recycle /ˌriːˈsaɪkl/ | use bottles, paper, etc. again instead of throwing them away | We recycle all our glass bottles. |
| pollution /pəˈluːʃn/ | dirty air, water or land caused by people | There is a lot of air pollution in big cities because of the traffic. |
| wildlife /ˈwaɪldlaɪf/ | animals and plants living in nature | The national park is full of wildlife — deer, eagles and wolves. |
| endangered /ɪnˈdeɪndʒəd/ | at risk of disappearing for ever | Tigers are an endangered species — there are very few left. |
| litter /ˈlɪtə/ | rubbish that people leave on the ground | Please put your litter in the bin. |
| climate change /ˈklaɪmət tʃeɪndʒ/ | the slow change in the Earth's weather, getting warmer | Climate change is making summers hotter and drier. |
| renewable /rɪˈnjuːəbl/ | coming from the sun, wind or water, so it never runs out | Wind and solar power are renewable energy. |
| habitat /ˈhæbɪtæt/ | the natural home of an animal or plant | The polar bear's habitat is the Arctic ice. |
| rainforest /ˈreɪnfɒrɪst/ | a thick, wet tropical forest | The Amazon rainforest is home to millions of species. |
| extinct /ɪkˈstɪŋkt/ | no longer existing — every one has died | Dinosaurs became extinct millions of years ago. |