environmental
bright
cable
caution
circle
color
colorful
concept
conservation
contour
danger
eco
ecology
electric
electricity
energy
environment
global
glowing
hazard
icon
illustration
isolated
light
line
linear
natural
nature
neon
nuclear
organic
outline
planet
pollution
power
problem
radiation
radioactivity
recycle
recycling
safety
set
sign
socket
symbol
toxic
world