Global warming is an issue of all nations. It became the cause of climatic changes and disasters such as hurricanes. Global warming itself is caused by the “greenhouse effect”, as the concentration of greenhouse gasses (such as carbondioxide) in the atmosphere increased. One simple way to eliminate the effect is by reducing carbondioxide. As we know, the photosynthesis process done by plants absorbs CO2 dan releases O2 which is important for living organisms. This campaign poster is meant to encourage people to plant trees in order to take part in fighting global warming.