Monday, November 23, 2020

Urban forests battle heat and pollution

 23 November 2020 (The Star)


SEOUL, South Korea, has recently launched an urban forest project, hoping to lower city temperatures by up to 7°C. From Phoenix in the United States to Mumbai, India, and Paris, France, as cities try to combat pollution and improve air quality, urban forests are mushrooming.


In South Korea, Seoul residents are increasingly faced with intense summer heat. In the summer of 2018, temperatures went up to 39.6°C during the hottest part of the day. 

However, the capital’s geographical location has two things going for it – it’s overlooked by two mountainous massifs, Bukhansan to the north and Gwanaksan to the south. 
Now, Korean authorities have decided to take advantage of the cooling However, the capital’s geographical location has twothings going for it – it’s overlooked by twomountainous massifs, Bukhansan to the north andGwanaksan to the south.

Now, Korean authorities have decided to takeadvantage of the cooling properties of these relieffeatures to try to ameliorate future heat waves.

The Seoul Metropolitan Government plans to install “wind path forests” along the rivers and roads, tocreate cooling air corridors that will flow into the citycentre. The project will commence as soon as asNovember, and work will continue until the end of2021. The total cost? US$15mil (RM62mil).Wind-generating species such as pine and maple trees will beplanted along the water. Wild cherry and oak, knownfor their ability to purify the air and absorb and blockparticulate matter, will also be planted on paths linkingthe forested areas to the city centre.

Action plans in cities worldwide

The Seoul project is far from unique. In the UnitedStates, urban forests are being employed to helpcongested cities breathe. Boston has just closed arequest for proposals to design its urban forest plan,while on the West Coast, Los Angeles has plans toplant 90,000 trees by 2021.

In Phoenix, Arizona, the Tree and Shade Master Planwas passed in 2010 to transform the city and providemore shade and cleaner air. Phoenix has since speededup its efforts, planting over 4,500 trees per year tocreate more shade.

In Mumbai, India, authorities are trying to increaseurban forest cover as fast as possible. An initiative toplant 10,000 local species of trees, with the support ofDCB Bank, will use the Japanese Miyawaki technique– named for its inventor – of planting dense forests ofnative species, which allows the trees to grow up to ahundred times faster than usual.

Meanwhile in Paris, mayor Anne Hidalgo hasannounced plans for urban forests next to multiple citylandmarks including the Hotel de Ville, Paris’ city hall,the Opera Garnier and the Gare de Lyon. — AFP Relax news

Thursday, November 12, 2020

Yellow Flame of the Forest (Peltophorum Pterocarpum) at Jln Sultan Azlan Shah (Tiger Lane) Ipoh

11 Nov 2020

As we take a ride along Jln Sultan Azlan Shah from the junction of Jln Sultan Nazrin Shah to the junction of North-South Highway in Ipoh, a distance of of approximately 7km, you will be able to find 550 trees of the species Yellow Flame of the Forest or its scientific name, Peltophorum Pterocarpum.


These trees were planted along this protocol road approximately 30 years ago.  Several prominent building can be found along this road; the Istana Cempaka Sari, the official residence of the Mayor of Ipoh and the Royal Golf Club on one side and the bungalow house of Datin Janet Yeoh, the mother of our famous actress Tan Sri Michelle Yeoh ( James Bond and Crouching Tiger).





According to the notes in wikipedia:

It is a deciduous tree growing to 15–25 m (rarely up to 50 m) tall, with a trunk diameter of up to 1 m belonging to Family Leguminosae and sub-family Caesalpiniaceaea. The leaves are bipinnate, 30–60 cm long, with 16–20 pinnae, each pinna with 20–40 oval leaflets 8–25 mm long and 4–10 mm broad. The flowers are yellow, 2.5–4 cm diameter, produced in large compound raceme up to 20 cm long. Pollens are approximately 50 microns in size.




How much CO2 is being absorbed?

Base on the current size and height, each tree is estimated to weigh about 800kg.  A tree will absorb CO2 and convert it into carbon. This process is called carbon sequestration.

Each kg of tree can absorb approximately 3.46 kg CO2 per year. Thus the amount of CO2 absorbed by these 550 trees is approximately:

= 800 x 3.46 x 550 

= 152,240 kg of CO2

How many cars travel along this road?

Based on the estimation of 30 cars per km per minute for a period of 5 hours a day, there is an average of 15,000 cars per year travelling along this road. Each car generate 4,600kg of CO2 per year. Thus, the total amount of CO2 produced by these cars along this road is about 115,920,000kg.

Conclusion:

The amount of carbon absorption by these 550 trees is only 152,240kg per year

The amount of CO2 produced by cars along this road is 115,920,00kg per year

Hence, the percentage of CO2 absorbed by trees along this road = 0.13%

Discussion:

More needs to be done by all of us to help turn Ipoh into a low carbon city. This can be achieved through:

a. Planting more trees

b. Use public transportation

c. Car pool

d. Use Electric Cars

e. Cycle or walk more

d. Use low carbon emission transport