Describe how scientific or technological activities are exacerbating or improving the existing situation of the Antarctic food web

Answer 1

Here is one example:
http://www.eco-action.org/dt/krill.html

The "ozone hole" in the Antarctic is casued by human activity: the release of chlorofluorocarbons into the atmosphere. Fortunately, laws were passed changing the refrigerants used in air conditioners and propellants used in spray cans, so that the ozone hole should disappear in about fifty years. In the meantime, the problem will get worse before it gets better.