The International Children's Painting Competition on the Environment is organized annually by the United Nations Environment Programme (UNEP), the Japan-based Foundation for Global Peace and Environment (FGPE), Bayer and Nikon.
It has been held since 1991 and has received over 190,000 entries from children in over 100 countries.
This year's competition will focus on climate change.
The children's paintings can focus on concrete actions such as using renewable energy, introducing energy saving light bulbs at home, sharing vehicles and using public transport, or planting trees.
The competition will run until 15 January 2008. Visit the UNEP website for full details.