The increasing rate of urbanization in Nairobi has resulted into encroachment into forested area. It is therefore important that developers should adopt sustainable development. However, this is not always the case due to the high rate of urbanization. A green city is not only looked at in terms of green space but this is one of the major factors that contribute to a city being a green city. Other factors that contribute tit the greenness of a city are; efficient population monitoring, green forms of transportation, water quality and reduced air pollution. Green plants absorb the suns radiation for photosynthesis with a little portion reflected or transmitted through. The temperature around cities is therefore maintained and this is very important in areas which experience summer climate all through the year. Flooding that occurs in Nairobi during heavy downpour can be significantly reduced by the rooftop gardens that absorb storm water. Carbon dioxide, a major byproduct is used by plants for photosynthesis and oxygen is subsequently released.
Cities and urban areas are 3 to 8°C warmer than surrounding areas due to the heat island
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Nairobi experiences rapid urbanization and population growth .Kenya registered high rates of urban growth largely from rural–urban migration and Nairobi accounts for better part of the migrations. With increased population there will be need for employment and jobs are majorly offered in business centers and districts. This implies that there will be need to create more space in the business centers and this generally involves clearing of land to bring up buildings. There will massive urban sprawl and encroachment into rich agricultural and water catchment