What are some ways in which the media makes negative and positive contributions to the public's perception of science?
The media make positive contributions to the public perception of science all the time simply by raising awareness. People are more likely to embrace that which they understand. In many cases science progress is dependent on tax monies or contributions; the media can help increase the flow of money toward a specific project, or toward an entire field.
On the negative side, sometimes the media creates such a sensation that people start to believe that science and medicine can now fix anything and everything. This can lead to feelings that one can do anything one wants to, because a doctor or a scientist can come along and fix it. This leads to people failing to take responsibility and initiative on things such as caring for their health or trying to reduce their carbon footprint.