Wonderings about news reporting

As I watch or read the news I wonder who is reporting this and how accurate is the article. For example, global warming. There all two definate camps here. First, the one that truely believes that the human population is destroying the Earth and then the other one that is convinced that all the data collected about global warming is falsified. Perhaps, both are correct to a point. Increase in population would use more natural resources, such as air or water, but also the Earth is constantly changing. Now, how does the news media play into this? They report to increase viewership or readership. It's all about money. The more people that are interested in a newspaper or other news reporting agency the more that institution will gain monetarily. How does one define the term "news"? Is it fact or opinion? So my wonderings for today is how can a person know who to believe and how much muck must one tramp through to get to the truth? Mmm!