* separar palavras-chave com vírgula
Melhores sites Environment 1-15:
1.
washingtonpost.com 
509,434

2.
 
382,979

3.
nationalgeographic.com 
341,340

4.
usgs.gov 
265,356

5.
fao.org 
254,797

6.
msu.edu 
222,558

7.
popsci.com 
162,178

8.
greenpeace.org 
144,015

9.
sudaneseonline.com 
102,968

10.
esa.int 
81,187

11.
wn.com 
62,348

12.
wto.org 
60,252

13.
mongabay.com 
47,413

14.
nationsonline.org 
44,595

15.
cgiar.org 
43,266

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