Salmond: 50 years of North Sea resources 'still to come'
24 February 2014 Last updated at 10:31 GMT
Investment in the North Sea will lead to "half a century of massive oil and gas resources still to come", SNP leader Alex Salmond has said.
Speaking to the Today programme, he said it was "key" to improve cooperation between North Sea operators and increase efficiency in the recovery of oil.
First broadcast on BBC Radio 4's Today programme on Monday 24 February.