Urban Heat Island (UHI) Effect arises due to absorption of incident radiation from the sun by built surfaces of tall buildings, roof, concrete structures and asphalt roads and then releasing it in the form of heat. The term “urban heat island” describes the built-up areas that are significantly hotter than the surrounding open, natural or rural areas. It occurs on the surface and in the atmosphere. The built surfaces are made of high-percentage of non-reflective and water-resistant construction materials. These materials act as heat sinks that absorb the radiated heat and store it for long time. The Urban Heat Island … Continue reading →
Sand and dust storms cause significant negative impacts on society, economy and environment at local, regional and global scale. There are three key factors responsible for the generation of sand and dust storms – strong wind, lack of vegetation and absence of rainfall. The environmental and health hazards of such storms cannot be reduced permanently, however its impact can be reduced by taking appropriate measures. As the dust cloud rises, it reduces the horizontal visibility which can impact human life in many ways. The fine suspended particles also contain contaminants, bacteria, pollens, which cause negative health impacts such as allergies and respiratory diseases. Dust also … Continue reading →
The Middle East and North Africa (MENA) is known for being one of the hottest places on Earth, and highly vulnerable to climate change impacts. In an IPCC special report on regional climate change, models projected that average temperatures in the region will increase by 1-2˚C by 2030-2050. Decision makers and citizens in all 21 countries realize that they are faced with an immediate need to reshape energy, agriculture, water and environmental policy to adapt to changing climate conditions. Steep Rise in Temperature Satellite data provided by Climate Engine from 1979 to present shows the mean max (average maximum) temperatures … Continue reading →
Green roofs are emerging technologies that can provide a wide range of tangible and intangible benefits to communities interested in enhancement of their environment. Green roof development involves the construction of a vegetative layer on top of a building adding green space to areas that would otherwise be unused. The major benefits of green roofs are reducing energy use as well as air pollution and greenhouse gas emissions, enhancing stormwater management and water quality, decreasing urban heat island effect by regulating temperature for the roof and the surrounding areas and providing aesthetic value and habitats for many species. What are … Continue reading →
Before the current pandemic that the world is battling, East Africa and neighbouring regions of the globe experienced the biggest locust infestation in the past 70 years. That event was devastating. Then the Covid-19 pandemic started to move across the globe. And just as a viral plague can resurface if adequate measures are not taken and sustained for a long enough period of time to interrupt the spread of the virus, the locusts have returned. The locust plague has reappeared in East Africa and is said to be 20 times the strength of the earlier infestations. The Fight for Food … Continue reading →
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