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People in Pakistan's most populous city, Karachi, are increasingly concerned about how their vegetables are being grown. Many are now trying to use new farming techniques to produce their own food. Al Jazeera's Osama Bin Javaid reports from Karachi. - Subscribe to our channel: http://bit.ly/AJSubscribe - Follow us on Twitter: https://twitter.com/AJEnglish - Find us on Facebook: https://www.facebook.com/aljazeera - Check our website: http://www.aljazeera.com/