Sorry, but polar bear population is at an all-time high. In the Davis Strait area, for example, it's increased from around 850 in 1980 to over 2,100 today.
Similarly, coral reefs and associated sea-life are more threatened by fishing practices than they are by anything else. Ocean acidification is the next great scam. Life-forms like corals will rapidly adapt to small changes in ocean PH, as they have been doing for hundreds of millions of years, unless you're suggesting ocean PH has been the same, to within tenths of a unit, for all of that time.
The problem you're exhibiting is generally called a discontinuous mind You're simply parroting everything you've read on alarmist websites, without actually thinking it through for yourself, or following up your references.