The Yale Center for Environmental Law and Policy’s annual ranking of the world’s cleanest countries. The Environmental Performance Study measures a country’s achievements in terms of the state of the environment and management of natural resources based on 22 indicators in 10 categories that reflect various aspects of the state of the natural environment and the vitality of its ecological systems, conservation of biodiversity, combating climate change, the state of public health, economic activity practices and the degree of its environmental burden, and the effectiveness of government environmental policies.

1 Denmark
2 Great Britain
4 Malta
5 Sweden
6 Luxembourg
7 Slovenia
8 Austria
9 Switzerland
10 Iceland
11 Netherlands
12 France
13 Germany
14 Estonia
15 Latvia
16 Croatia
17 Australia
18 Slovakia
19 Czech Republic
20 Norway
21 Belgium
22 Cyprus
23 Italy
24 Ireland
25 Japan