People are being urged to join UK landmarks as they switch off their lights for an hour on Saturday night to back action on climate change.
Apple CEO in Glasgow
Apple boss Tim Cook is to collect an honorary degree from the University of Glasgow.
The chief executive of the technology giant will be awarded a doctorate of science in a ceremony at the university on Wednesday evening.
He will then take part in a ''fireside chat'' and Q&A session with students and university staff.
Issues of privacy and surveillance could be topics of conversation, with students at the university having elected Edward Snowden as rector in 2014.
Despite being unable to travel to the UK, the US National Security Agency whistleblower won the vote after releasing details of phone and internet surveillance.
Mr Cook has taken a strong stance on user privacy and clashed with US intelligence agencies last year over the issue.
Tickets for the event sold out in under an hour.
A spokeswoman for the University of Glasgow said: ''The event is not open to everyone, it is only open to staff and students.
''Bute Hall holds a few hundred people and it's now sold out.''
Since taking the helm of the company, Mr Cook has led the introduction of new products such as the iPhone 7, iPad Pro and Apple Watch.
He is also leading a company-wide effort to use 100% renewable energy at all Apple facilities.
In 2015, the 56-year-old became an honorary patron of Trinity College Dublin's Philosophical Society and gave a talk to students.
A former youth football scout has been arrested by police investigating allegations of historical abuse in the sport.
Police are investigating whether purple pills found in Fife are connected to a case in which a teenage boy fell ill.
A Royal Navy helicopter pilot has paid a flying visit to his former aircraft to see its transformation into an unusual holiday home near Stirling.
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