Climate change is already a reality for densely populated Bangladesh, and the battle is on to deal with its effects. br br Flooding occurs in Bangladesh twice a year, leaving its land victim to erosion. In 2007 alone, 10 million Bangladeshis were affected by rising waters. Scientists estimate that by 2050, Bangladesh could lose almost a fifth of its land, leaving 20 million homeless. br br Riz chats with a Bangladeshi architect who is doing something about it.