International travel could be restricted by carbon passports as global temperatures rise, a well-known holiday company has warned.

A report by small group tour company Intrepid Travel claimed drastic measures could be introduced as many popular destinations face "extinction".

It predicted that "personal carbon allowances" may be introduced to reduce emissions.

The report stated: "These allowances will manifest as passports that force people to ration their carbon in line with the global carbon budget, which is 750 billion tonnes until 2050.

"By 2040, we can expect to see limitations imposed on the amount of travel that is permitted each year."