Burning heat, sandstorms and drought plague those whose homes are in the areas along the border of Afghanistan and Iran. Water can sometimes be so scarce in these provinces that it has to be brought to villages by tanker. The region became a deadly battlefield earlier this year, with exchanges of fire days after Iranian President Ebrahim Raisi threatened the Afghan Taliban in a dispute over water from a major river. The Lake Hamun biosphere reserve is not far from the border posts. Old photos of the ecosystem with its glistening water surface and flamingos are a reminder of the beauty of what …