Dear Dr. Semy,

Interesting question, here is a list of free environmental journals:

Springer:

1. Environmental Earth Sciences

2. Environmental Pollution

3. Environmental Science and Pollution Research

4. Science of the Total Environment

Elsevier:

1. Agriculture, Ecosystems & Environment

2. Chemosphere

3. Ecological Engineering

4. Ecological Indicators

5. Ecotoxicology and Environmental Safety

6. Journal of Environmental Management

7. Journal of Hydrology 8. Water Research

OR

1. International Journal of Environmental Research and Public Health

2. Environmental Science and Pollution Research

3. International Journal of Environmental Studies

4. Sustainability

5. Science of the Total Environment

6. Environmental Pollution

7. Ecological Indicators

8. Journal of Cleaner Production

9. Environmental Science & Technology

10. Global Change Biology

11. PLoS ONE

12. Nature Climate Change

13. Environmental Research

14. Environmental Health Perspectives

15. Environmental Research Letters

Hope this information helps...