abstract
advocate
background
beginning of spring
blue
carbon emissions
cartoon
concept
conservation
creativity
earth
earth day
earth hour
education
electricity
emission reduction
energy
energy saving
environment
environmental protection
green
hands
health
hold up
illustration
light bulb
lights
lights out
love
low carbon
nature
plants
poster
power saving
protection
public welfare
rest
scenery
sleep
spring
style
technology
time
trees
turn off lights
vernal equinox
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