The council has teamed-up with a consortium of Leeds companies for the initiative. This week 1,500 trees were planted in Leeds’ partner city of Durban, South Africa.
Up to 10 times as many trees will be planted in the build-up to the 2010 World Cup.
Some trees will be planted in residents' gardens in deprived townships to help provide extra food and security for local people, as well as increase levels of biodiversity and help prevent soil erosion.
Leeds leader Mark Harris (Lib Dem) said: “Leeds City Council is committed to being a green authority and this tree-planting scheme is one of a number of projects which are helping to minimise the effect that its actions have on the environment.”