Green
Top Countries By Forest Growth Since 2001
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Ranked: Top Countries By Forest Growth Since 2001
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Reforestation is tricky business: it’s expensive, difficult to plan, and even harder to execute. And this is without all the associated environmental obstacles: weather, pests, and natural calamities.
However, some countries have prioritized replanting their lost forests, especially in the last two decades as the climate movement has gathered steam.
We visualized forest growth around the world, ranking countries by their forest area increases between 2001–2021, measured in square kilometers (km²).
All of this data was sourced from the World Bank. Note that countries are ranked by forest growth in square kilometers, rather than percentage change.
Which Country Leads Forest Growth Since 2001?
China tops the list, expanding its forest area by nearly 425,000 km2 (roughly the size of Sweden) between 2001–21. This is more than the next 19 countries combined. Relatively speaking, China’s forests increased by almost one-fourth.
Rank | Country | Region | 2001–21 Change (Km2) | % of Forest Growth |
---|---|---|---|---|
1 | 🇨🇳 China | Asia | 424,962 | 24% |
2 | 🇺🇸 U.S. | North America | 57,406 | 2% |
3 | 🇷🇺 Russia | Europe | 54,564 | 1% |
4 | 🇮🇳 India | Asia | 46,449 | 7% |
5 | 🇻🇳 Vietnam | Asia | 27,745 | 23% |
6 | 🇨🇱 Chile | South America | 24,257 | 15% |
7 | 🇦🇺 Australia | Oceania | 24,178 | 2% |
8 | 🇹🇷 Turkiye | Middle East | 21,345 | 11% |
9 | 🇫🇷 France | Europe | 19,353 | 13% |
10 | 🇪🇸 Spain | Europe | 13,374 | 8% |
11 | 🇮🇷 Iran | Middle East | 13,033 | 14% |
12 | 🇮🇹 Italy | Europe | 11,848 | 14% |
13 | 🇨🇺 Cuba | Central America | 7,573 | 30% |
14 | 🇹🇭 Thailand | Asia | 7,315 | 4% |
15 | 🇺🇿 Uzbekistan | Asia | 7,152 | 24% |
16 | 🇺🇾 Uruguay | South America | 6,468 | 46% |
17 | 🇷🇴 Romania | Europe | 5,482 | 9% |
18 | 🇧🇬 Bulgaria | Europe | 4,948 | 15% |
19 | 🇧🇾 Belarus | Europe | 4,734 | 6% |
20 | 🇵🇱 Poland | Europe | 4,090 | 5% |
N/A | 🌍 World | -957,658 | -2% |
There are some other countries who have achieved similar relative levels of reforestation. Within Asia, Vietnam’s forests as a percentage of total land area have doubled since 1990. Since 2001, its forests have grown nearly 28,000 km², a 23% increase.
Uzbekistan similarly expanded its forested area by 24%, which amounts to about 7,000 km².
Meanwhile, Chile and Uruguay, are the only two South American countries that have managed to expand their forest cover in the last two decades—the latter by a staggering 46%. In contrast, the rest of South America is instead seeing significant deforestation.
It’s interesting to note that reforestation also comes with its own risks. Introducing non-native or monoculture tree species can reduce biodiversity and lead to soil erosion.
And despite global reforestation efforts, the world still lost close to a million square kilometers of forests since 2001.
Environment
The Most Polluted Cities in the U.S.
What are the most polluted cities in the U.S. according to data from the American Lung Association’s 2024 State of the Air Report?
The Most Polluted U.S. Cities in 2024
According to the World Health Organization, air pollution is responsible for 7 million deaths annually, and could cost the global economy between $18–25 trillion by 2060 in annual welfare costs, or roughly 4–6% of world GDP.
And with predictions that 7 in 10 people will make their homes in urban centers by mid-century, cities are fast becoming one of the frontlines in the global effort to clear the air.
In this visualization, we use 2024 data from the State of the Air report from the American Lung Association to show the most polluted cities in the United States.
What is Air Pollution?
Air pollution is a complex mixture of gases, particles, and liquid droplets and can have a variety of sources, including wildfires and cookstoves in rural areas, and road dust and diesel exhaust in cities.
There are a few kinds of air pollution that are especially bad for human health, including ozone and carbon monoxide, but here we’re concerned with fine particulate matter that is smaller than 2.5 microns, or PM2.5 for short.
The reason for the focus is because at that small size, particulate matter can penetrate the bloodstream and cause all manner of havoc, including cardiovascular disease, lung cancer, and chronic pulmonary disease.
The American Lung Association has set an annual average guideline of 9 µg/m³ for PM2.5, however, the World Health Organization has set a much more stringent limit of 5 µg/m³.
The 21 Worst Polluted Cities in the U.S.
Here are the top 21 most polluted cities in the U.S., according to their annual average PM2.5 concentrations:
Rank | City, State | Annual average concentration, 2020-2022 (µg/m3) |
---|---|---|
1 | Bakersfield, CA | 18.8 |
2 | Visalia, CA | 18.4 |
3 | Fresno, CA | 17.5 |
4 | Eugene, OR | 14.7 |
5 | Bay Area, CA | 14.3 |
6 | Los Angeles, CA | 14.0 |
7 | Sacramento, CA | 13.8 |
8 | Medford, OR | 13.5 |
9 | Phoenix, AZ | 12.4 |
10 | Fairbanks, AK | 12.2 |
11 | Indianapolis, IN | 11.9 |
12 | Yakima, WA | 11.8 |
13 | Detroit, MI | 11.7 |
T14 | Chico, CA | 11.6 |
T14 | Spokane, WA | 11.6 |
15 | Houston, TX | 11.4 |
16 | El Centro, CA | 11.1 |
17 | Reno, NV | 11.0 |
18 | Pittsburgh, PA | 10.9 |
T19 | Kansas City, KS | 10.8 |
T19 | Las Vegas, NV | 10.8 |
Note: The American Lung Association uses Core Based Statistical Areas in its city and county rankings, which have been shortened here to the area’s principal city, or metro area in the case of the Bay Area, CA.
Six of the top seven cities are in California, and four in the state’s Central Valley, a 450-mile flat valley that runs parallel to the Pacific coast, and bordered by the Coast and Sierra Nevada mountain ranges. As a result, when pollution from the big population centers on the coast is carried inland by the wind—cities #5 and #6 on the list—it tends to get trapped in the valley.
Bakersfield (#1), Visalia (#2), and Fresno (#3) are located at the drier and hotter southern end of the valley, which is worse for air quality. The top three local sources of PM2.5 emissions in 2023 were farms (20%), forest management / agricultural waste burning (20%), and road dust (14%).
Benefit to Economy
While the health impacts are generally well understood, less well known are the economic impacts.
Low air quality negatively affects worker productivity, increases absenteeism, and adds both direct and indirect health care costs. But the flip side of that equation is that improving air quality has measurable impacts to the wider economy. The EPA published a study that calculated the economic benefits of each metric ton of particulate matter that didn’t end up in the atmosphere, broken down by sector.
Sector | Benefits per metric ton |
---|---|
Residential Woodstoves | $429,220 |
Refineries | $333,938 |
Industrial Boilers | $174,229 |
Oil and Natural Gas Transmission | $125,227 |
Electricity Generating Units | $124,319 |
Oil and Natural Gas | $88,838 |
At the same time, the EPA recently updated a cost-benefit analysis of the Clean Air Act, the main piece of federal legislation governing air quality, and found that between 1990 and 2020 it cost the economy roughly $65 billion, but also provided $2 trillion in benefits.
Benefit to Business
But that’s at the macroeconomic level, so what about for individual businesses?
For one, employees like to breathe clean air and will choose to work somewhere else, given a choice. A 2022 Deloitte case study revealed that nearly 70% of highly-skilled workers said air quality was a significant factor in choosing which city to live and work in.
At the same time, air quality can impact employer-sponsored health care premiums, by reducing the overall health of the risk pool. And since insurance premiums averaged $7,590 per year in 2022 for a single employee, and rose to $21,931 for a family, that can add up fast.
Consumers are also putting their purchase decisions through a green lens, while ESG, triple-bottom-line, and impact investing are putting the environment front and center for many investors.
And if the carrot isn’t enough for some businesses, there is the stick. The EPA recently gave vehicle engine manufacturer Cummins nearly two billion reasons to help improve air quality, in a settlement the agency is calling “the largest civil penalty in the history of the Clean Air Act and the second largest environmental penalty ever.”
Learn how the National Public Utilities Council is working toward the future of sustainable electricity.
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