Having an initial condition ensemble can help to identify natural variability in the system and deal with it.

The expected amount of warming is very small compared with the natural variability in the earth's temperature.

The exact cause of the changes in circulation patterns is not known and they may be due to natural variability.

Meteorologists are looking to see if there's a pattern, but it's more likely to be natural variability.

It is possible that this warming could be an expression of the climate system's natural variability.

The cheese is produced daily, and it can show a natural variability.

This natural variability makes it difficult to discern any human influence on climate.

Some of the effects also could be natural variability, he said.

One reason may be the great natural variability of the virus.

There is more than enough natural variability in nature to mask a direct connection, they say.