one green planet complete guide
This is the tale of two ancient cities and the trees that determined their destinies in 3000 bc uruk was more densely populated than modern-day new york city this crowded capital had to continually expand their irrigation system to feed its growing population 2,500 years later in Sri Lanka the city of anuradhapura had a similar problem.
They were also growing constantly and like Brook their city relied heavily on an elaborate irrigation system as Luke grew its farmers began chopping down trees to make space for more crops in anuradhapura however trees were sacred their city housed an offshoot of the Bodhi tree under which buddha himself was said to have attained enlightenment religious reverence slowed farmers axes and even led the city to plant additional trees in urban parks initially were rooks expansion worked well but without trees to filter their water supply works irrigation system became contaminated evaporating water left mineral deposits which rendered the soil too salty for agriculture conversely a nirodha parez irrigation system was designed to work in concert with the surrounding forests their city eventually grew to more than twice Brookes population and today anuradhapura still cares for a tree planted over 2,000 years ago.
we may think of nature as being unconnected to our urban spaces but trees have always been an essential part of successful cities trees act like a natural sponge absorbing stormwater runoff before releasing it back into the atmosphere the webs of their roots protect against mudslides while allowing soil to retain water and filter out toxins roots help prevent floods while reducing the need for storm drains and water treatment plants their porous leaves purify the air by trapping carbon and other pollutants making them essential in the fight against climate change humanity has been uncovering these arboreal benefits for centuries but trees aren't just crucial to the health of a city's infrastructure they play a vital role in the health of its citizens as well in the 1870s Manhattan had a few trees outside the islands parks without trees to provide shade buildings absorbed up to nine times more solar radiation during deadly summer heat waves combined with the periods poor sanitation standards the oppressive heat made the city a breeding ground for bacteria like cholera in modern-day Hong Kong t
all skyscrapers and underground infrastructure make it difficult for trees to grow this contributes to the city's dangerously poor air quality which can cause bronchitis and diminished lung function trees affect our mental health as well research indicates that the presence of green foliage increases attention spans and decreases stress levels it's even been shown that hospital patients with views of brick walls recover more slowly than those with views of trees fortunately many cities are full of views like this and that's no accident as early as the 18th century city planners began to embrace the importance of urban trees in 1733 Colonel James Oglethorpe planned the city of Savannah Georgia to ensure that no neighborhood was more than a two minute walk from a park.
After World War two Copenhagen directed all new development along five arteries of each sandwiched between a park this layout increased the city's resilience to pollution and natural disasters and urban trees don't just benefit people Portland's Forest Park preserves the region's natural biodiversity making the city home to various local plants 112 bird species and 62 species of mammals no city is more committed to trees than Singapore since 1967 Singapore's government has planted over 1.2 million trees including those within 50 meter tall vertical gardens called super trees these structures sustain themselves and nearby conservatories with solar energy and collected rainwater trees and vegetation currently cover over 50 percent of Singapore's landmass reducing the need for air conditioning and encouraging low pollution transportation by 2050 it's estimated that over 65 percent of the world will be living in cities city planners can lay an eco-friendly foundation but it's up to the people who live in these urban forests to make them homes for more than humans the time to get involved with the climate movement is now don't know where to start we've partnered with the UN to create a 30 day challenge designed to teach you everything you need to know to become a part of the solution start the challenge with a friend or family member today
