Oh, the irony. The BBC reports:

An expedition team which set sail from Plymouth on a 5,000-mile carbon emission-free trip to Greenland have been rescued by an oil tanker. […]

The team, which left Mount Batten Marina in Plymouth on 19 April in a boat named the Fleur, aimed to rely on sail, solar and man power on a 580-mile (933km/h) journey to and from the highest point of the Greenland ice cap.

The expedition was followed by up to 40 schools across the UK to promote climate change awareness.

But atrocious weather dogged their journey after 27 April, culminating with the rescue on 1 May after the boat was temporarily capsized three times by the wind. […]

The crew were 400 miles (644km) off the west coast of Ireland when they sent a mayday to Falmouth coastguards who co-ordinated the rescue with Irish coastguards.