environmental protection
huan2jing4bao3hu4 环境保护 / 環境保護
to economize / to conserve (resources) / economy / frugal
jie2yue1 节约 / 節約
the Earth
di4qiu2 地球
to go for a hike (esp. in the hills or mountains)
pa2shan1 爬山
energy sources / energy
neng2yuan2 能源
with regard to
yu2 于 / 於
to push / to shove
tui1 推
[m.w. for part / section / segment]
duan4 段
useful / beneficial / profitable
you3yi4 有益
air / atmosphere
kong1qi4 空气 / 空氣
haze / smog
wu4mai2 雾霾 / 霧霾
to recycle
hui2shou1 回收
bottled water
ping2zhuang1shui3 瓶装水 / 瓶裝水
bright / light
liang4 亮
tube / cylinder / to encase in sth cylindrical (such as hands in sleeves etc)
tong3 筒
to throw / to throw away
reng1 扔
The Sun
tai4yang2 太阳 / 太陽
Solar energy
tai4yang2neng2 太阳能 / 太陽能
board / plank / panel
ban3 板
to generate electricity
fa1dian4 发电 / 發電
country / nation / state
guo2jia1 国家 / 國家
crisis
wei1ji1 危机 / 危機
oil / petroleum
shi2you2 石油
wind
feng1 风 / 風