Mapped: The Greenest Countries in the World

From widening wealth disparity to the environmental ramifications of economic development—the growing focus on global sustainability is a clear sign of the times.

Research reveals that when a sustainable ethos is applied to policy and business, it typically bodes well for economies and people alike. By providing benchmarks for those decisions, indexes like Yale’s Environmental Performance Index (EPI) can be critical to measuring national sustainability efforts.

The above map interprets the EPI ranking of 180 economies across 32 environmental health indicators by narrowing in on the top 40 greenest countries.

Who’s the Greenest of them All?

Despite the decades-long trend of globalization, national environmental policies have proved to be widely divergent. The EPI report confirms that those policies—and their positive results—are highly correlated with national wealth.

This is evidenced in the global EPI distributions, seen below:

Regional grouping in the report include: Global West, Asia-Pacific, Eastern Europe, Former Soviet States, Greater Middle East, Latin America & Caribbean, Southern Asia, and Sub-Saharan Africa

Scandinavian countries, which tend to have a high GDP per capita, show strong and consistent results across EPI parameters. Denmark for instance—which ranks first overall—leads the world in slowing its growth in CO2 emissions. Meanwhile, neighbor Sweden leads in landfill and recycling treatment, while wastewater treatment is led by a handful of countries within and beyond Scandinavia including Denmark, Finland, the Netherlands, Singapore, and Sweden.

In North America, Canada claims top spot in the biodiversity and habitat category, while the U.S. ranks sixth in agricultural diversity globally. In Asia, Singapore leads the world in fishery health and sustainability.

Ultimately, it appears the world’s greenest countries tend to focus on all areas of sustainability, while laggard countries show more uneven performance across categories.

What Does “Green” Mean?

Each high-level performance indicator with the EPI, like “environmental health”, is broken into subsections. Nations are scored on each subsector on a scale up to 100. As a result, multiple countries can rank first in any given category.

By evaluating national sustainability on a scale that is unrelated to other nations, we get a clearer idea of comparative national progress, beyond a basic ranking.

For instance, 30 countries tie for first in marine protection, all with scores of 100. This shows that many economies are prioritizing this area of sustainability.

The EPI categories and subsectors are shown in the diagram below:

Each section is weighted differently, and is reflected as a percentage within the index. For example, Ecosystem Vitality accounts for 60% of the EPI, Climate Change makes up 24% of a country’s score, and CO2 emission reduction is weighted at 13.2%.

The Cost of Being Green

Infrastructure costs are one reason why wealthier nations tend to fare better across sustainability measures. Everything from air pollution reduction and water treatment, to hazardous waste control and mitigation of public health crises are especially expensive—but have a huge potential impact on citizens.

This trend can be seen the scatterplot, which demonstrates the distribution of economies evaluated by the EPI:

For a more detailed look, the table below highlights the GDP per capita of each of the top 40 greenest countries, based on data from the World Bank and Statista:

Despite the strong correlation between GDP per capita and EPI score, developing countries do not have to abandon sustainability efforts. China for instance leads the world in the adoption of electric vehicle technology.

Post-Pandemic Outlook

Although some rankings can seem prosaic, indexes like the EPI provide a helpful benchmark for economies to compare efforts. It also allows governments to iterate and build upon environmental strategies and investments by highlighting what is and isn’t working.

CO2 emissions, for instance, are a major driver of climate change. Although the global economic stall has led to a temporary dip of CO2 emissions in early 2020 (a slower growth rate than the 11% expected rise), global emissions still continue.

However, the EPI shows that investments have impact. High-level sustainability efforts—political commitment, media coverage, regulations—can deliver results, even at the grassroots level.

The Population of China in Perspective

China is the world’s most populous country with an astounding 1.44 billion citizens. Altogether, the size of the population of China is larger than nearly four regions combined: South America, Europe (excluding Russia), the U.S. & Canada, and Australia & New Zealand.

Using data from the United Nations, this unconventional map reveals the comparative size of China’s population next to a multitude of other countries.

Note: To keep the visualization easy to read, we’ve simplified the shapes representing countries. For example, although we’ve included Alaska and Hawaii in U.S. population totals, the U.S. is represented by the contiguous states map only.

A Historical Perspective

Looking at history, the population of China has more than doubled since the 1950s. The country was the first in the world to hit one billion people in 1980.

However, in 1979, in an attempt to control the burgeoning population, the infamous one-child policy was introduced, putting controls on how many children Chinese citizens could have.

While the government eventually recognized the negative implications of this policy, it appeared to be too little, too late. The two-child policy was introduced in 2016, but it has not yet reversed the current slowdown in population growth.

The fertility rate has been consistently falling from over 6 births per woman in 1955 to 1.69 in 2020. Today, the median age in China is 38 years old, rising from 22 in 1955. Longer life spans and fewer births form a demographic trend that has many social and economic implications.

Overall, China’s young population is becoming scarcer, meaning that the domestic labor market will eventually begin shrinking. Additionally, the larger share of elderly citizens will require publicly-funded resources, resulting in a heavier societal and financial burden.

Strength in Numbers

Despite these trends, however, China’s current population remains massive, constituting almost 20% of the world’s total population. Right now 71% of the Chinese population is between the ages of 15 and 65 years old, meaning that the labor supply is still immense.

Here are the populations of 65 countries from various regions of the world—and added together, you’ll see they still fall short of the population of China:

To break it down even further, here’s a look at the population of each of the regions listed above:

• Australia and New Zealand: 30.3 million
• Europe (excluding Russia): 601.7 million
• South America: 430.8 million
• The U.S. and Canada: 368.7 million

Combined their population is 1.432 billion compared to China’s 1.439 billion.

Overall, the population of China has few comparables. India is one exception, with a population of 1.38 billion. As a continent, Africa comes in close as well at 1.34 billion people. Here’s a breakdown of Africa’s population for further comparison.

Future Outlook on the Population of China

Whether or not China’s population growth is slowing appears to be less relevant when looking at its sheer size. While India is expected to match the country’s population by 2026, China will remain one of the world’s largest economic powerhouses regardless.

It is estimated, however, that the population of China will drop below one billion people by the year 2100—bumping the nation to third place in the ranking of the world’s most populous countries. At the same time, it’s possible that China’s economic dominance may be challenged by these same demographic tailwinds as time moves forward.