It might be a good idea to stock up on chocolates, for they are going to turn costly in just about 20 years.

“In 20 years chocolate will be like caviar. It will become so rare and so expensive that the average Joe just won’t be able to afford it,” The New Zealand Herald quoted John Mason, executive director and founder of the Ghana-based Nature Conservation Research Council, as saying.

Farmers in the countries that produce the bulk of cocoa do not get incentives for the time-consuming work of replanting as their trees die off – a task that usually means moving to a new area of canopied forest and waiting three to five years for a new crop to mature.

The children of these African cocoa farmers, whose life expectancy is only 56, therefore prefer working in cities than undertaking backbreaking work for such a small reward.

“The other challenge is that cocoa is competing for agricultural space with other commodities like palm oil – which is increasingly in demand for biofuels,” explained Thomas Dietsch, research director of ecosystem services at the Earthwatch Organisation.