World CO2 levels are highest in 650,000 yrs'
Scientists have warned that cli mate change could soon begin to get out of control, with concentration of carbon dioxide in the atmosphere touching a record high. Scientists at the Mauna Loa observatory in the US state of Hawaii say that CO2 levels in the atmosphere now stand at 387 parts per million (ppm), up almost 40 per cent since the industrial revolution and the highest for at least the last 650,000 years.