Category:20th century in the environment

15th
16th
17th
18th
19th
20th
21st
22nd
23rd
24th
25th

Subcategories

This category has the following 5 subcategories, out of 5 total.

1

N

Non-renewable resource companies established in the 20th century‎ (3 C)

P

Protected areas established in the 20th century‎ (1 C)

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