A new report by the Food and Agriculture Organization (FAO) warned that mankind's future ability to feed itself is in jeopardy due to intensifying pressures on natural resources, mounting inequality, and the fallout from a changing climate, a UN spokesman said here Wednesday. "Though very real and significant progress had been made in reducing global hunger in the past, this has come at a heavy cost to the natural environment," UN spokesman Stephane Dujarric said at a daily news briefing here.