Syful Islam
22 March 2012
SciDev.net
[DHAKA] Researchers in the United States say agricultural waste from coconut and mango farming could generate significant amounts of off-grid electricity for rural communities in South and South-East Asia.
Many food crops have a tough, inedible part which cannot be used to feed livestock or fertilise fields. Examples of this material — known as 'endocarp' — include coconut, almond and pistachio shells, and the stones of mangoes, olives, plums, apricots and cherries.
Endocarp is high in a chemical compound known as lignin. High-lignin products can be heated to produce an energy-rich gas that can be used to generate electricity.
The researchers identified high-endocarp-producing regions of the world – and noted that coconut and mango agriculture account for 72 per cent of total global endocarp production. Coconut production alone accounted for 55 per cent.
Most coconut endocarp comes from South and South-East Asian countries, including Bangladesh, Laos, Malaysia, Myanmar, Thailand, and Vietnam.
They then overlaid these findings with energy consumption data to identify communities with little access to electricity, who could benefit from endocarp-based energy.
"We noticed that production was unevenly distributed around the globe, which could make a very significant contribution to the energy budget in some countries like Sri Lanka, Indonesia, and the Philippines, [as well as] regions of India," Tom Shearin, co-author and a systems analyst at University of Kentucky, United States, told SciDev.Net.
Writing in the Proceedings of the National Academies of Sciences (February 21), the researchers said endocarp bioenergy could meet up to 30 per cent of total energy needs in Sri Lanka, 25 per cent in the Philippines, 13 per cent in Indonesia, and 3 per cent in India.
Shearin said endocarp was preferable to crop-based biofuels as it had no value as a food item. "Its exploitation as energy source does not compete with food production," he said.
Wais Kabir, executive chairman of the Bangladesh Agriculture Research Institute, told SciDev.Net that most of the country's agricultural waste, including non-edible by-products, was already used to generate bioenergy.
"I don't think that supply of adequate volumes of coconut shell, [for example] to run a power plant, is possible at this stage until we go for its production in a planned way," he said.
The researchers acknowledged that efforts to scale up infrastructure to deliver decentralised bio-energy in developing countries would face economic, technical and social challenges.
Advocates of an endocarp-based energy sector would also have to persuade investors that it would be financially viable.
Abser Kamal, managing director of Grameen Shakti, a renewable energy firm in Bangladesh, said: "We have to check if these are cost-effective or not".
Islam Sharif, CEO of the Infrastructure Development Company Limited (IDCOL), a state-run renewable energy financing firm in Bangladesh, said IDCO would encourage investment in endocarp-based energy production if it was found to be financially viable.
"Bangladesh needs more energy sources to meet its power needs," Sharif told SciDev.Net.
http://www.scidev.net/en/climate-change-and-energy/renewable-energy/news/coconut-and-mango-waste-could-help-power-asia.html
Sunday, March 25, 2012
Thursday, March 8, 2012
Scientists identify genetic vulnerability to arsenic-related cancers
Syful Islam
7 March 2012 | SciDev.net
[DHAKA] People at greater risk of developing debilitating or fatal diseases related to arsenic exposure could be prioritised for treatment, following a study by Bangladeshi and US researchers.
Exposure to arsenic through contaminated drinking water is a major public health issue affecting millions of people, mostly in South Asia.
A previous study had linked as many as one in five deaths in Bangladesh to arsenic exposure, and the WHO has called the phenomenon "the largest mass poisoning" in history.
The new study — published in PLoS Genetics last month (23 February) — looked at why some people are more susceptible to arsenic poisoning, with a view to establishing whether there is a genetic basis to their susceptibility.
Researchers studied the entire genomes of 3,000 people in Bangladesh and found that those who developed arsenic-related skin lesions shared a common area of their genomes. Such lesions are an indicator of overall susceptibility to other arsenic-related diseases.
The researchers said their findings suggested that up to a third of the Bangladeshi population carries the genetic variation.
"The precise risk estimates are being investigated," said lead author Habibul Ahsan, an epidemiology professor at the University of Chicago, United States.
Ahsan told SciDev.Net that the discovery could inform the design of targeted screening programmes to identify those most at risk of developing arsenic-related illness.
"Since millions of exposed people can't realistically be treated, our findings will help identify susceptible sub-groups that can be provided with specific medical treatments," Ahsan said.
At present, he said, people with the genetic disposition have no alternative but to avoid contaminated water, although he acknowledged this was not always possible.
But he added that a range of treatments are being investigated, including low-cost therapies using vitamin E, selenium and folic acid, all of which are in clinical trials.
Once treatments become available, Ahsan said, those with the genetic susceptibility could be prioritised for treatment.
"We know from Chile and Taiwan that the risk of arsenic-related cancers and death remains high for the rest of [the lives of arsenic-affected people] — even after the exposure [risk] is removed by the provision of safe water," he said.
The researchers plan further large-scale studies, with a view to persuading the Bangladeshi government to engage more actively with the issue.
"This will help our doctors in curative and preventive management of arsenic-exposed patients," said Sudhir Kumar Ghosh, superintendent engineer at the Department of Public Health Engineering, in Bangladesh.
http://www.scidev.net/en/health/genomics/news/scientists-identify-genetic-vulnerability-to-arsenic-related-cancers.html
7 March 2012 | SciDev.net
[DHAKA] People at greater risk of developing debilitating or fatal diseases related to arsenic exposure could be prioritised for treatment, following a study by Bangladeshi and US researchers.
Exposure to arsenic through contaminated drinking water is a major public health issue affecting millions of people, mostly in South Asia.
A previous study had linked as many as one in five deaths in Bangladesh to arsenic exposure, and the WHO has called the phenomenon "the largest mass poisoning" in history.
The new study — published in PLoS Genetics last month (23 February) — looked at why some people are more susceptible to arsenic poisoning, with a view to establishing whether there is a genetic basis to their susceptibility.
Researchers studied the entire genomes of 3,000 people in Bangladesh and found that those who developed arsenic-related skin lesions shared a common area of their genomes. Such lesions are an indicator of overall susceptibility to other arsenic-related diseases.
The researchers said their findings suggested that up to a third of the Bangladeshi population carries the genetic variation.
"The precise risk estimates are being investigated," said lead author Habibul Ahsan, an epidemiology professor at the University of Chicago, United States.
Ahsan told SciDev.Net that the discovery could inform the design of targeted screening programmes to identify those most at risk of developing arsenic-related illness.
"Since millions of exposed people can't realistically be treated, our findings will help identify susceptible sub-groups that can be provided with specific medical treatments," Ahsan said.
At present, he said, people with the genetic disposition have no alternative but to avoid contaminated water, although he acknowledged this was not always possible.
But he added that a range of treatments are being investigated, including low-cost therapies using vitamin E, selenium and folic acid, all of which are in clinical trials.
Once treatments become available, Ahsan said, those with the genetic susceptibility could be prioritised for treatment.
"We know from Chile and Taiwan that the risk of arsenic-related cancers and death remains high for the rest of [the lives of arsenic-affected people] — even after the exposure [risk] is removed by the provision of safe water," he said.
The researchers plan further large-scale studies, with a view to persuading the Bangladeshi government to engage more actively with the issue.
"This will help our doctors in curative and preventive management of arsenic-exposed patients," said Sudhir Kumar Ghosh, superintendent engineer at the Department of Public Health Engineering, in Bangladesh.
http://www.scidev.net/en/health/genomics/news/scientists-identify-genetic-vulnerability-to-arsenic-related-cancers.html
Monday, March 5, 2012
Climate migrants cause baby boom in Bangladesh's urban slums
02 Mar 2012
By Syful Islam
DHAKA, Bangladesh (AlertNet) – Climate and economic migrants to Bangladesh’s urban slums are contributing to a population boom that is creating social strains in this tiny and impoverished country of 160 million people.
“Lack of awareness and education, unavailability of contraceptives, absence of a social safety net and uncertainty over the future are among the reasons behind the baby boom of the slum refugees,” said Ainun Nishat, an environmentalist and vice chancellor of Brac University.
Bangladesh is suffering increasingly frequent flooding from cyclones and from heavy rainfall that experts believe is associated with climate change. Its coastal plains are particularly at risk, but many who live in the country’s interior are also vulnerable to river bank erosion – or conversely to drought.
When flooding and erosion displace families, and in many cases leave them landless and penniless, they often take refuge in urban areas, and have little option but to live in slums. There, lack of education about family planning, poor access to birth control and worries about financial security combine to result in large families.
“These unlucky people feel that in old age they will have to depend on children to secure a living. So, they prefer to take more number of children to be sure that at least one of them will take care of the parents,” Nishat said.
HIGH SLUM FERTILITY RATE
According to the 2006 Bangladesh Urban Health Survey, the total fertility rate – the average number of children born to a woman during her lifetime – is 4.5 in urban slums, far higher than the overall national rate of 2.5.
Bangladesh’s total fertility rate has plummeted over the past five decades from a peak of more than 7. But the country’s population density, the increasing frequency of natural disasters, and heavy migration to cities mean that the higher fertility rate among slum dwellers is set to create growing economic and social pressures.
Hamid Mia, 50, is a father of five who works as a boatman near the Korail slum in Dhaka, the country’s capital, where he has lived for 20 years. He lost his village home in Chaulakathi, in the southern district of Barishal, after the Kochar River claimed his family's land.
Mia’s two sons are rickshaw pullers while his three daughters work in garment factories to help the family.
“My sons and daughters are also working, as I can’t bear all the expenses of a seven-member family,” he said.
The World Bank estimates that nearly 42 million Bangladeshis, somewhat more than a quarter of the country’s population, live in urban areas. According to Nurun Nabi, a professor in the University of Dhaka’s Population Science Department, around 40 percent of urban residents live in slums, and they contribute three-quarters of live births in urban areas.
“Every couple (of child-bearing age) in the slums has around five to six children, while the other city dwellers have on an average two to three babies,” said Nabi.
“I do not know if all the slum dwellers are climate refugees but most of them have come from the countryside as they lost living places due to river erosion (or were) displaced due to natural calamities and lacked somewhere to live,” he said.
ENVIRONMENTAL MIGRANTS
The International Organization for Migration (IOM) said that about 70 percent of slum dwellers in Dhaka have experienced some kind of environmental disaster. By some accounts, half a million people move to the city each year, mainly from coastal and rural areas.
Ahsan Uddin Ahmed, executive director of the Centre for Global Change, a non-governmental organisation, said that the capital contributes 31 percent of the country’s GDP, making it attractive to people displaced by climate change and disasters and looking for jobs.
Ahmed and fellow researcher Sharmind Neelormi estimate that erosion, soil salinity and waterlogging of soil alone have the potential to displace about 100,000 rural residents annually. But population migration due to flooding is on a far greater scale.
Tahera Akter, a researcher with Unnayan Onneshan, an NGO, found that during the period 1970-2009, Bangladesh suffered major floods every three years on average, and that each occurrence displaced an average of a quarter of the country’s population. Akter predicts that as many as 78 million people could be displaced by floods, cyclones and droughts by 2020.
Dhaka’s population has grown to about 12 million since the nation’s independence in 1971, and the city’s slum population has increased from 275,000 in 1974 to 3.4 million in 2005, according to the Centre for Urban Studies, a Bangladeshi think tank.
Ahmed said that many slum residents are illiterate and do not understand that a big family can bring burdens for society as well as for themselves. To stop the population boom, he said that ensuring education of girls and women is crucial.
EDUCATING WOMEN KEY
International studies show that educating women and providing health care to ensure their children survive is one of the surest ways of reducing birth rates.
M.M. Neazuddin, director general of the government’s Family Planning Directorate, said that while family planning activities outside cities are meeting with success, the lack of adequate health services and awareness programmes in slum areas is causing the population boom in urban slums.
Neazuddin said that his office will implement a crash programme within a year to try to bring down the fertility rate in city slums.
In Korail slum, Hamid Mia said that some health centres run by the city corporation did exist.
“Health workers there offer family planning advice but I think those are not enough to reduce population growth. Providing contraceptives free of cost as well as motivation may help,” he said.
Brac University’s Nishat said that in the past health workers had supplied free contraceptives door to door, which had helped reduce population growth.
“But the government, on the World Bank’s advice, has stopped the door-to-door service and made it health-centre based,” he said. The problem is that the health centres are often far from people’s homes, and as a result, “people feel discouraged to avail themselves of the facility,” he said.
Syful Islam is a journalist with The Financial Express newspaper in Dhaka. He can be reached at: youths1990@yahoo.com.
http://www.trust.org/alertnet/news/climate-migrants-cause-baby-boom-in-bangladeshs-urban-slums/
By Syful Islam
DHAKA, Bangladesh (AlertNet) – Climate and economic migrants to Bangladesh’s urban slums are contributing to a population boom that is creating social strains in this tiny and impoverished country of 160 million people.
“Lack of awareness and education, unavailability of contraceptives, absence of a social safety net and uncertainty over the future are among the reasons behind the baby boom of the slum refugees,” said Ainun Nishat, an environmentalist and vice chancellor of Brac University.
Bangladesh is suffering increasingly frequent flooding from cyclones and from heavy rainfall that experts believe is associated with climate change. Its coastal plains are particularly at risk, but many who live in the country’s interior are also vulnerable to river bank erosion – or conversely to drought.
When flooding and erosion displace families, and in many cases leave them landless and penniless, they often take refuge in urban areas, and have little option but to live in slums. There, lack of education about family planning, poor access to birth control and worries about financial security combine to result in large families.
“These unlucky people feel that in old age they will have to depend on children to secure a living. So, they prefer to take more number of children to be sure that at least one of them will take care of the parents,” Nishat said.
HIGH SLUM FERTILITY RATE
According to the 2006 Bangladesh Urban Health Survey, the total fertility rate – the average number of children born to a woman during her lifetime – is 4.5 in urban slums, far higher than the overall national rate of 2.5.
Bangladesh’s total fertility rate has plummeted over the past five decades from a peak of more than 7. But the country’s population density, the increasing frequency of natural disasters, and heavy migration to cities mean that the higher fertility rate among slum dwellers is set to create growing economic and social pressures.
Hamid Mia, 50, is a father of five who works as a boatman near the Korail slum in Dhaka, the country’s capital, where he has lived for 20 years. He lost his village home in Chaulakathi, in the southern district of Barishal, after the Kochar River claimed his family's land.
Mia’s two sons are rickshaw pullers while his three daughters work in garment factories to help the family.
“My sons and daughters are also working, as I can’t bear all the expenses of a seven-member family,” he said.
The World Bank estimates that nearly 42 million Bangladeshis, somewhat more than a quarter of the country’s population, live in urban areas. According to Nurun Nabi, a professor in the University of Dhaka’s Population Science Department, around 40 percent of urban residents live in slums, and they contribute three-quarters of live births in urban areas.
“Every couple (of child-bearing age) in the slums has around five to six children, while the other city dwellers have on an average two to three babies,” said Nabi.
“I do not know if all the slum dwellers are climate refugees but most of them have come from the countryside as they lost living places due to river erosion (or were) displaced due to natural calamities and lacked somewhere to live,” he said.
ENVIRONMENTAL MIGRANTS
The International Organization for Migration (IOM) said that about 70 percent of slum dwellers in Dhaka have experienced some kind of environmental disaster. By some accounts, half a million people move to the city each year, mainly from coastal and rural areas.
Ahsan Uddin Ahmed, executive director of the Centre for Global Change, a non-governmental organisation, said that the capital contributes 31 percent of the country’s GDP, making it attractive to people displaced by climate change and disasters and looking for jobs.
Ahmed and fellow researcher Sharmind Neelormi estimate that erosion, soil salinity and waterlogging of soil alone have the potential to displace about 100,000 rural residents annually. But population migration due to flooding is on a far greater scale.
Tahera Akter, a researcher with Unnayan Onneshan, an NGO, found that during the period 1970-2009, Bangladesh suffered major floods every three years on average, and that each occurrence displaced an average of a quarter of the country’s population. Akter predicts that as many as 78 million people could be displaced by floods, cyclones and droughts by 2020.
Dhaka’s population has grown to about 12 million since the nation’s independence in 1971, and the city’s slum population has increased from 275,000 in 1974 to 3.4 million in 2005, according to the Centre for Urban Studies, a Bangladeshi think tank.
Ahmed said that many slum residents are illiterate and do not understand that a big family can bring burdens for society as well as for themselves. To stop the population boom, he said that ensuring education of girls and women is crucial.
EDUCATING WOMEN KEY
International studies show that educating women and providing health care to ensure their children survive is one of the surest ways of reducing birth rates.
M.M. Neazuddin, director general of the government’s Family Planning Directorate, said that while family planning activities outside cities are meeting with success, the lack of adequate health services and awareness programmes in slum areas is causing the population boom in urban slums.
Neazuddin said that his office will implement a crash programme within a year to try to bring down the fertility rate in city slums.
In Korail slum, Hamid Mia said that some health centres run by the city corporation did exist.
“Health workers there offer family planning advice but I think those are not enough to reduce population growth. Providing contraceptives free of cost as well as motivation may help,” he said.
Brac University’s Nishat said that in the past health workers had supplied free contraceptives door to door, which had helped reduce population growth.
“But the government, on the World Bank’s advice, has stopped the door-to-door service and made it health-centre based,” he said. The problem is that the health centres are often far from people’s homes, and as a result, “people feel discouraged to avail themselves of the facility,” he said.
Syful Islam is a journalist with The Financial Express newspaper in Dhaka. He can be reached at: youths1990@yahoo.com.
http://www.trust.org/alertnet/news/climate-migrants-cause-baby-boom-in-bangladeshs-urban-slums/
Subscribe to:
Posts (Atom)