It’s getting weirder.
A few thoughts . . .
Has anything like the sudden death of many fish/birds, etc. occurred globally before, but no connection been established?
Could it be due to a natural phenomenon like say, unusually cold weather and/or water? Seems to me that the 2010 climate summit was held in Brazil and if I remember correctly, they were experiencing unseasonably cold weather.
The earth’s magnetic poles have been reversing for some years now and scientists are not sure what we can expect, if anything, to happen as a direct result of this natural and expected process.
The incidents so far may be coincidental, but unrelated.
I just don’t want to jump to conclusions. This really could be something that happens once in awhile in nature. We may never know the cause.