The UN has been measuring its green house gas emissions from facilities and travels since 2009 and in 2013 emitted at least 1.7 million tonnes of carbon dioxide equivalent.
A total of nine (9) UN-system. Organisations achieved climate neutrality for 2013 by measuring, reducing and offsetting their greenhouse gas emissions.
Cities are major contributors to climate change, according to UN habitant cities consume 78 percent of the world's energy and produce more than 60 percent of green house gas emissions. Yet, they account for less than 2 percent of the earth's surface.
Efforts by policy makers and administrators to keep pace with population growth and rapid climate change has been intensified and to address the issue of climate change in cities, UN-Habitat, UNEP, the world bank and cities alliance have established the joint work programme to assist cities in developing countries to mainstream environmental considerations in urban policy making.
It is a fact that both Climate Change and Air Pollution are exacerbated by the burning of fossil fuels, which increases C02 emissions and other harmful gases limited quality air which also global warning. In October 2018, the World Health Organization (WHO) said in a report that 93% of the world’s children breathe toxic air every day. According to the report 1.8 billion children breathe air that is so polluted which puts their health and development at serious risk.

Together with the WHO and The Climate and Clean Air Coalition, UN environment is part of the global “Breath Life Campaign” helping to mobilize cities and encourage individuals to protect the planet from effects of air pollution.