Gaza is filled with more debris and rubble than Ukraine, the UN said Wednesday, with the mammoth task of clearing it made all the more costly and dangerous by the sheer amount of asbestos and unexploded ordnance. Six months into Israel’s war on Gaza Strip, the United Nations Mine Action Service (UNMAS) estimated the amount of debris in the Palestinian enclave at 37 million tonnes in mid-April, or 300 kilogrammes per square metre. “Gaza has more rubble than Ukraine, and to put that in perspective, the Ukrainian front line is 600 miles (nearly 1,000 kilometres) long, and Gaza is 25 miles (40 km)…