What is this?
Traffic jam.
What is this?
Pollution/Carbon gas.
What is this?
Plant trees.
What is this?
Recycle.
What is this?
Ride bikes.
What is this?
Take/use public transport.
What is this?
Park/Green areas.
What is this?
Trash/Litter/Waste/Garbage.
What is this?
Garbage can/Litter can/Dustbin.
