London is planning to plant two million trees by 2025, increasing greenery by 5%, in an effort to combat rises in summer temperature during this century. Temperatures could rise by 3.9C by 2080, with the hottest days soaring to 6C to 10C above the present records. London suffers from the “urban heat island effect” in which buildings absorb and release heat, maintaining a higher temperature in cities than surrounding areas, and so it will be more affected by global warming than the South-east.  However, research done in Manchester suggests that a 10% increase in trees in a city can offset the higher temperatures predicted. Other plans involve green roofs and featuring waterproofing and drainage layers topped with soil and plants. The Guardian

See also Leading to a Greener London pdf ( Boris Johnson propoganda?)