In the real world human travel can give a great impact to local ecology by introduction of flora, fauna, viruses and bacteria.
Looking at the Ancients' mistakes, Stargate travel is an ecological nightmare waiting to happen.
1. The plague which wiped out life in the MW galaxy. (But in the Pegasus it seems they wisen up a bit adding biofilters to the stargates.)
2. The spread of human populations in the Pegasus galaxy lead to the evolution of the Wraith.
3. The Goauld would not have become a threat if they did not leave their world.
Looking at the Ancients' mistakes, Stargate travel is an ecological nightmare waiting to happen.
1. The plague which wiped out life in the MW galaxy. (But in the Pegasus it seems they wisen up a bit adding biofilters to the stargates.)
2. The spread of human populations in the Pegasus galaxy lead to the evolution of the Wraith.
3. The Goauld would not have become a threat if they did not leave their world.
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