World grain reserves are so dangerously low that severe weather in the US or other food-exporting countries could trigger a hunger crisis next year.

Mexico City is developing one of the world's most pressing environmental problems. In the metropolis of 20-million people, rivers of sewage flow slowly through many of its poor neighbourhoods, it loses 40% to 50% of all its water supplies in leaks and 100 cubic metres of hard-to-dispose waste is generated every second.

In the future nearly all the world's major rivers are expected to come under increased pressure to provide water for farming and industry.

British scientific researchers have demonstrated for the first time that genetically modified DNA material from crops is finding its way into human gut bacteria, raising potentially serious health questions.

World grain reserves are so dangerously low that severe weather in the US or other food-exporting countries could trigger a hunger crisis next year.

Amnesty International has reported that Shell lied about the magnitude of an oil spill in the Niger Delta.

Water scientists say mankind may have to switch almost completely to a vegetarian diet over the next 40 years to avoid catastrophic shortages.

US envoy warns that reserves are perhaps 40% overstated and the kingdom won't be able to keep prices down.