The scientific community has always been largely driven by money and politics. You need to ask yourself "who is paying" before looking at any research. Even if the research the scientists do proves against what whoever paid for it wanted, it will state exactly what they wanted it to say. Scientific research is doctored toward the institution's desires. To think that there was once some kind of golden age of truth (at least within reason, mind that philosophers of old were often less driven by politics) where scientists accurately represented their research without bias is foolish. Same with politics. Same with business. Same with most things.

Human's corrupt that which they touch, few are truth seekers and honorable. And even when they are there are usually people above them who arent.

Global warming is grossly over-exaggerated, but that doesnt mean it's entirely false. Global warming is not what it sounds or what a lot of people seem to assume it is, simply put it's human's effecting the environment in negative ways that are becoming far reaching, global even, and causing climate change. Dont throw the concept entirely out the window, and dont accept everything you hear. People seem to like to believe that they are innocent and everyone else is at fault, it's much harder to take a critical look at oneself and try to see their flaws. Thus people who are environmentalists can blame the people who pollute and people who pollute to a higher level like to throw the idea they are doing something wrong out the window.

As to the topic of fishing, if you are licensed to do so and arent breaking the law and you consider the impact you are having on the animals yourself and make an informed, rational decision, then you are fine, if you are fishing illegally then you are taking malicious action against the environment and the people who are licensed to do so.