About:

• World Oceans Day is celebrated across the world on June 8. It is an annual event designed to encourage people to celebrate the oceans and take steps to protect ocean health.
• Canada first proposed the concept for World Oceans Day in 1992 at the Earth Summit in Rio de Janeiro. Then, in 2004, the Ocean Project and World Ocean Network launched a four-year petition to the United Nations to officially recognise 8 June as World Oceans Day.
• Four years later, in December 2008, a United Nations resolution designated the day for the oceans.
• The World Oceans Day Theme for 2020 is “Innovation for a Sustainable Ocean”.

Earth Summit

• United Nations Conference on Environment and Development (UNCED), byname Earth Summit, was a conference held at Rio de Janeiro, Brazil (June 3–14, 1992), to reconcile worldwide economic development with protection of the environment.
• The Earth Summit was the largest gathering of world leaders as of 1992, with 117 heads of state and representatives of 178 nations in all attending.
• By means of treaties and other documents signed at the conference, most of the world’s nations nominally committed themselves to the pursuit of economic development in ways that would protect the Earth’s environment and nonrenewable resources

References:

https://www.un.org/en/observances/oceans-day

https://www.business-standard.com/article/current-affairs/world-oceans-day-2020-theme-images-importance-of-june-8-importance-of-oceans-and-more-120060800089_1.html