New Scientist: HAS global warming stopped? The trend has stalled in recent years, but climate modellers this week said this amounts to a "blip" caused by natural variability. What's more, a forecast made in 1999 has actually proven correct over the past decade although temperatures will have to start rising again soon if it is going to stay on track (see "Climate modellers vindicated as forecast comes true"). The most likely cause of the recent blip is changing heat flows between oceans and atmosphere. If so,...