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Are these the world’s greenest countries?

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The threat posed by climate change has fast become one of the hottest topics on the planet.

The "Climate Change Performance Index 2015" (CCPI) assessed the green credentials of 58 countries that are said to be responsible for over 90 percent of global energy-related CO2 emissions.

The index, which is produced by lobbying groups Germanwatch and Climate Action Network Europe, uses standardized criteria to assess countries' climate-protection performance.

According to the index's compilers, nowhere deserves a top-three ranking because "no country is doing enough to prevent dangerous climate change."

In this slideshow, CNBC looks at the progress made by the index's top-performing 10 countries, from Iceland in 13th place to Denmark in 4th.

The top 10 in the list is dominated by European countries. The United States finishes near the bottom of the list, in 44th, one place above China.

By Anmar Frangoul, special to, on Tuesday 23 December 2014.

Sungjin Kim | Moment | Getty Images