英文關鍵字
solar
energy
climate
change
eco
problem
nature
care
day
conservation
world
desertification
renewable
glacier
melt
bio
electricity
erosion
sustainable
agriculture
flood
land
sea
ocean
crisis
children
polar
bear
tree
fire
carbon
dioxide
co2
dry
desert
car
ecosystem
protect
icon
motion
animation
hd
animated