Orthodox Perspectives on Creation
Report of the WCC Inter-Orthodox Consultation, Sofia, Bulgaria, October 1987 (Extracts)http://www.goarch.org/en/ourfaith/articles/article8050.asp
The environmental crisis
(...) 18. Environmental issues like air and water pollution, depletion of non-renewable resources, destruction of the ozone layer, increasing nuclear radiation, deforestation and desertification of vast areas, etc. threaten the life itself on this planet. The gifts of science and technology are being misused by human beings to the extent of abusing nature and turning today's life on earth into a hell, not only for the many millions of existing people but also for the generations to come.
Encyclical of Ecumenical Patriarch Bartholomew for the Day of the Protection of Our Natural Environment - September 1
The use of atomic and nuclear forces of nature for war is an insult to creation and Creator, as is over-consumption of any kind, which burdens the natural environment with pollutants, which leads to climate change and global warming and an imbalance in the natural order, with all that implies. The immense consumption of energy for purposes of war and the excessive consumption of contemporary humanity far beyond its needs are two areas where the responsibilities of political leaders and common citizens are interwoven in such a way so that each of us has the power to contribute to the betterment of the general condition.
These are just a couple of references I was able to dig up. I do remember attending the International Conference on Violence and Christian Spirituality that was held at HC a number of years ago, and I recall Nuclear war being brought up, but I think it was by one of the protestants that was there. Then again, I don't have my notes with me, so I can't be 100% sure that none of the Orthodox brought it up - they very well may have.