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"On a geological timescale ice sheets have come and gone, but on a human timescale if we lose them we can basically consider them gone forever."

"Our study is also working on the geological timescale in millions of years," he said.

Movement of rivers, mountains, oceans and sediment nutrients at the geological timescale are the central drivers of Earth's biodiversity, new research published today in Nature has revealed.

On a geological timescale, "very quickly" means in thousands to hundreds of thousands of years.

It warmed the planet rapidly on a geological timescale, although it was nowhere near the rapidity of what we’re doing today.