The UN highlighted the need for quick measures to curb carbon emissions and build climate resilience amid the threats posed by the increase in global warming and the risk of the recurrence of the El Niño phenomenon during the observation of World Environment Day 2026.

Over 2,000 events around the world took place on June 5 when nations, private organizations, educational institutions, and other entities observed the annual celebration, which was organized by Azerbaijan. The celebrations occurred amidst the emergence of record-high temperatures and worries about the adverse effects of climate change on the economy and social issues.

UN Secretary-General António Guterres stated that the past eleven years have been the warmest ever and that the planet was on its way to experiencing an exceptional violation of the maximum warming limit of 1.5 degrees as set out by the Paris Agreement. Guterres called for more carbon emission cuts, a rapid transition to renewable energy sources, lower methane emissions, and better protection of forests, land, and marine resources.

Guterres further appealed to developed economies to honor their climate finance pledges.

Extreme heat emerged as a central theme of this year's observance. The UN Environment Programme (UNEP) said heat-related risks are becoming a growing threat to public health, productivity and economic activity in many regions.

Ahead of World Environment Day, more than 50 cities joined UNEP's 50@50 initiative, which focuses on sharing strategies to address extreme heat. Participating cities included Paris, Melbourne, Lagos, Antalya, Mendoza, and Yangzhou.

At the official event in Baku, Azerbaijan's Minister of Ecology and Natural Resources, Rashad Ismayilov, said the country plans to nearly double its renewable energy capacity by 2030. Azerbaijan has pledged to cut emissions by 40% by 2035 and generate 30% of its electricity from renewable sources by 2030.

UNEP Executive Director Inger Andersen said environmental pressures linked to climate change are becoming increasingly visible and called for stronger adaptation and mitigation efforts.

In addition, a policy brief was launched by the organization, which emphasized the increasing use of clean technologies in the domains of energy, transport, buildings, and food systems. UNEP states that due to decreasing costs and increased usage, technologies like solar energy, electric mobility, and sustainable cooling are being used extensively.

Activities related to World Environment Day also consisted of public awareness campaigns and environmental initiatives that were organized in many countries. It was reported that these activities aimed at enhancing the pace at which action against climate change could be taken.