CHRA calls for Lake Chivero pollution to be declared a national disaster HARARE – The Combined Harare Residents Association (CHRA) has called on the Government to declare the worsening pollution of Lake Chivero a state of national disaster, warning that unchecked contamination is threatening public health, increasing water treatment costs and undermining Zimbabwe's environmental sustainability. Speaking at a media briefing in Harare on Tuesday, CHRA Programmes Manager Mable M