If your audience is young, it'd be youth culture, if your audience is older, it'd be older people, if it were senior citizens, it'd be senior citizen issues. So you try and hit the target audience. ↗
Well, news is anything that's interesting, that relates to what's happening in the world, what's happening in areas of the culture that would be of interest to your audience. ↗
There is no doubt that we should take solar radiation into account. We have seen ground temperatures rising since 1975, and it is important to know to what extent that has been caused by the sun or by carbon dioxide. ↗