abstract
background
blue
boy
care
children
clock
concept
day
democracy
earth
eco
ecology
energy
family
global
globe
globus
good
green
hand
holding
holiday
idea
isolated
love
man
mother
nature
oxygen
ozone
palm
parents
peace
people
planet
plasticine
problem
protection
rescue
safety
save
space
symbol
text
time
together
training
white
world