Tossa (Corchorus olitorius L.) is a significant cash crop, cultivated commercially in the lower flood plain of Bangladesh. The climatic regimes in Bangladesh are changing as well as the world does. However, this species is threatened by climate change. Occurrences of data on threatened and endangered species are frequently sparse which makes it difficult to analyse the species suitable habitat distribution using various modelling approaches. The current paper used maximum entropy (Maxent) and educational global climate model (EdGCM) modelling to predict and conserve the suitable habitat distributions for Tossa species in Bangladesh to the year 2100. Nine environmental variables, 239 occurrence data and two Representative Concentration Pathway scenarios (RCP4.5 and RCP8.5) were used for the Maxent modelling to project the impact of climate change on the Tossa distributions. Furthermore, the EdGCM was used to study the climatic space suitability for the Tossa species in the context of Bangladesh. Both of the climatic scenarios were used for the prediction to the year 2100. The Maxent model performed better than random for the Tossa species with a high AUC value of 0.86. Under the RCP scenarios, the Maxent model predicted habitat reduction for RCP4.5 is 2%, RCP8.5 is 9% and EdGCM is 10.2% from the current localities. The predictive modelling approach presented here is promising and can be applied to other important species for conservation planning, monitoring and management, especially those under the threat of extinction due to climate change.

Urban green spaces are the indispensable component in city landscaping for realising a healthy living environment (HLE). The environmental quality was assessed in the Dhaka City Corporation (DCC) area, Bangladesh, by means of the existing green spaces, population density and air-quality mapping. This study revealed that Uttara, Mirpur 10, Kazipara, Darussalam, Shukrabad, Razabazar and the old city of Dhaka are the most significant environmentally critical areas. Also, it revealed that only six wards out of 92 wards of the DCC area (within the administrative boundary) met the per capita green spaces as per the standards of the World Health Organization (9 m2 per person) and the rest of the 86 wards required improvement of green areas. A green space plan map was also generated, which will be able to direct strategic options of the city's land-use planning to ensure an HLE. Information technology will provide valuable information about the management and implementation of new greenery development projects by DCC, Rajdhani Unnayan Karthipakaha and other voluntary organisation.

Ensuring food security is a global challenge that can be mitigated by improving agricultural production. From the last few decades, many developed nations have introduced modern and sustainable agricultural system to abate this challenge. Now, developing countries also demand the blessings of sustainable agricultural system to face this globally burning issue. The purpose of this study is to examine the current agricultural system of main crops and challenges of food security of Bangladesh. Therefore, on the basis of present scenarios of agricultural productivity, some suggestions have been proposed to combat the food security challenges. Mainly agricultural related secondary data published by the government of Bangladesh were analysed to conduct this research. All over the country, farmers are facing challenges of storage facilities, lack of modern agricultural machineries, unfriendly market policy of agro-products, less empathy of governments and natural disaster. Last few year's potato productions has been increasing noticeably because of soil fertility, due to farmer's well-mannered adaptation strategies to climate change, high yield crop seed, using optimum fertilizer, farmer's dearness etc. On the other hand, Jute, the world second largest product also declining the production which contributes 4.66% to economic growth. However, Government's initiatives can ensure food security and sustainable agricultural system of Bangladesh. In this context, farmer friendly agricultural policies, introducing modern technologies, as well as inventing climate adaptive new crop species can be helpful to achieve food security. This research gears towards realization of present agricultural productivity scenarios and to take proper measures by the decision makers of Bangladesh.

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