- Climatic changes--Congresses (7)
- Atmospheric ozone--Congresses (1)
- Ecology--Congresses (1)
- Environmental protection--Congresses (1)
- Man--Influence on nature--Congresses (1)
- Paleoclimatology--Congresses (1)
- Pinatubo, Mount (Philippines)--Eruption, 1991--Environmental aspects--Congresses (1)
- Plants, Effect of stress on--Congresses (1)
- Stratosphere--Congresses (1)
- Vegetation and climate--Congresses (1)
- Volcanic ash, tuff, etc.--Congresses (1)
- Weather--Effect of volcanic eruptions on--Congresses (1)