This is definitely not a thing where media is paying more attention, they are definitely on the rise. Too bad the GB didn't think of foretelling that years ago haha.
I have only 2 theories, 1 is perhaps it's due to pesticides and acid rain, and if that is the case, then it will get REAL bad. Here is my theory.....rain and water that saturates the ground either from acid rain or chemicals had spread fairly evenly and started around the same times. Let's say as the water hit cavern walls, if it was acidic or certain chemicals they began to eat away at the walls. It might take 5, 10, 20, 50 years, but if the water and chemicals remained at a constant, then it once it hit the correct time, the cavern would cave in. So the reason why sinkholes are poping up all over is because those are the ones that had the thinnest cavern walls and they are all giving out at the same time now. This explains why all over the world this is happening, whether Florida, northern states, South America, Europe, etc. If this theory is true, then it's only just started and they will increase exponentially in size and frequency because it would be awhile before reaching the peak.
Theory 2 - continental shifts.
What are your thoughts on what's going on?