The United Nations envoy to Yemen on Tuesday called for extending a long-sought truce between the government and Houthi rebels, which is set to expire in two weeks. The renewable two-month truce that went into effect in early April has made a “considerable positive impact on the daily lives of many Yemenis,” Hans Grundberg said at the end of a closed UN Security Council meeting. “Over the past six weeks, civilian casualties have dropped considerably, fighting has sharply reduced with no aerial attacks from Yemen across its borders and no confirmed airstrikes inside Yemen,” Grundberg went on. A…