"Internal variability will partially offset the anthropogenic global warming signal for the next few years," study leader Doug Smith said in the report.

But while variations in sea temperature and even light-blocking volcanic ash could soften the impact of man's ongoing contamination of the planet in some areas, overall global warming is still inevitable.

Many experts blame global warming for a rising tide of extreme weather that has caused flooding and heatwaves.

"The climate will continue to warm, with at least half of the years after 2009 predicted to exceed the warmest year currently on record," Smith said.

Previous projections of climate change accounted for external factors -- like changes in solar radiation absorbed by the earth's atmosphere -- and the effect of man but did not consider variations in natural influences on climate within the earth's atmosphere, according to Britain's official forecaster.

"Occurrences of El Nino, for example, have a significant effect on shorter-term predictions. By including such internal variability, we have shown a substantial improvement in predictions of surface temperature," Smith said.