Greenpeace volunteers pose for a group shot after performing an 'ocean wave' in Johannesburg, South Africa. At an event in the lead-up to World Oceans Day.

From Santiago to Bangkok, London to Johannesburg, Greenpeace volunteers and supporters create human waves across 23 countries to call for the protection of our seas and the creation of a network of ocean sanctuaries covering 30% of international waters by 2030.