What it's about:
Cities around the world appear to be setting the pace with their efforts to combat climate change while national governments drag their feet.
From Oslo to Sydney, cities are leading the way in setting ambitious goals to curb climate change, many of which often exceed national targets, and in some cases are causing tension with central governments about who controls policy over green energy, transport and construction.
A 2016 study projected that climate plans by cities and regions could cut an extra 500 million tonnes of annual greenhouse gas emissions by 2030 - equivalent to the emissions of France - beyond cuts pledged by governments.
From increasing reliance on solar initiatives to measures to curb car use, cities are taking a more assertive approach to tackling climate change than many national governments.
Why it's noteworthy:
Just over half the world's population lives in urban areas, and cities could prove the best testing ground for nations to creatively combat climate change.
More than 2,500 cities have submitted plans to cut carbon emissions to the United Nations since late 2014, setting an example to the almost 200 nations that reached an agreement in Paris in December 2015 to fight global warming.
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