Dhaka has witnessed a rise in temperature of almost 3 degrees Celsius in the last 20 years while the world is fighting to contain the increase in global temperature to under 1.5 degrees. The increase in annual daytime temperature in Dhaka over the last 20 years is 2.74 degrees Celsius, finds a study conducted on five major cities of Bangladesh. Like Dhaka, Chattogram, Rajshahi, Khulna, Barishal and Sylhet have also witnessed rising trends of day and night temperatures in the timeframe, said the study, which surmised that population density, lack of greenery, uneven building heights, and human activities are the main reasons behind the trend.