'At least 1,000 years' of climate havoc on way

Rising carbon dioxide emissions are likely to have an unstoppable impact on climate for another 1,000 years and raise global sea levels by at least four metres (13 feet), say scientists.

Global warming is expected to cause a catastrophic collapse of the West Antarctic ice sheet by the year 3000.

The gloomy prediction is a "best case" scenario, assuming that all use of fossil fuels ceases and no more carbon dioxide (CO2) is pumped into the atmosphere.

The study, published in the journal Nature Geoscience, is the first to make climate predictions looking ahead 1,000 years.