lablabi is unique to bizerte. >> so hassan saidani supplies bizerte's residents with fresh lablabi every ♪ >> the population of costa rica has more than doubled over the past forty years and now stands at 5 million. the cities are growing fast, and encroaching on the rainforest. farming g is also taking up more and more land. all that is having an impact on costa rica's water supply. for our series "global ideas," dw went to the outskirts of the capital san josÉ to explore possible solutions. >> no matter how much ricardo rubi turns the tap, nothing comes out. he'd like to wash his hands after a long day at work. >> often, we have had water in the mornings, for work, but then none in the afternoon. nothing comes out of the tap and we have to wait until 6:00, 7:00, 8:00, even 9:00 at night before we get any. so the dishes will have to wait, too. >>t's the same for thi entire neighborhood. one reason is increasing urbanization. there aren't enough pipelines and a modern water treatment plant is still under construction. three-quarters of costa rica's population lived here, in the greater m