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If we knew the fraction of a radioactive element still remaining in a mineral, it would be a simple matter to calculate its age by the formula To determine the fraction still remaining, we must know both the amount now present and also the amount present when the mineral was formed.

Contrary to creationist claims, it is possible to make that determination, as the following will explain: By way of background, all atoms of a given element have the same number of protons in the nucleus; however, the number of neutrons in the nucleus can vary.

However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.

So, we rely on radiometric dating to calculate their ages.

Then, shortly before the last great Ice Age released its grip, our ancestors set foot on the continent. In the last 10,000 years Europe has been transformed from a largely forested, virgin landscape in to the manicured continent we know today, and at an ever-accelerating rate.

As culture spread its influence across the land with monumental symbols of ownership, animals were tamed, seeds were sown, forests decimated and minerals excavated. How is wildlife adapting to this brave new world, who are the winners and losers, and what efforts are we making to help?

The methods work because radioactive elements are unstable, and they are always trying to move to a more stable state. This process by which an unstable atomic nucleus loses energy by releasing radiation is called radioactive decay.

The thing that makes this decay process so valuable for determining the age of an object is that each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life.

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Witness Oxford roamed by dinosaurs, the Jura vineyards of France swallowed under tropical seas, St Petersburg buried under desert sands and the mightiest event of all, the birth of the Mediterranean. Over the past two million years Europe has been swept by waves of extreme climatic change.

It has the same number of protons, otherwise it wouldn't be uranium.

The number of protons in the nucleus of an atom is called its atomic number.

"I claim there's only one infallible dating method – a witness who was there and who knows everything and who told us – that's the Word of God," Ham, president of Answers in Genesis, said.

Ham acknowledged that old earth creationists can still be Christians "because salvation is conditioned upon faith in Christ, not the age of the earth," but he did insist they were twisting Scripture.