I was just reading up on this and the thought occurred to me that it is not likely to be the sole cause. Think about the EMF radiation from cell towers, pesticides/GMOs, secret government testing, HAARP, polluted water, climate extremes like extreme heat and lack of water, jet stream wandering, and what about chemtrails? Here's a video of the chemtrailing going on right before 12/31/2010: Chemtrails in Okla and Ark before massive fish and bird deaths .
It seems somewhere in the chain of information, a decision was made that methane was the culprit, but I think with all the other factors in play that methane escaping from earth movements would only be one of many factors. In addition, consider the radiation that hit Europe from Chernobyl, local leaks, and now the ELE-waiting-to-happen at Fukushima, all the volcanic eruptions spewing ash and toxins into the air, continuing assaults on the magnetosphere, a magnetic pole shift in progress, local disasters like the BP oil spill in the Gulf of Mexico, and even ET/UFO involvement:
When flocks of birds die simultaneously and suddenly drop to the ground, could it be they are hitting a cloaked UFO, or its force field? Of all the theories I've read, this one makes the most sense. Could fish kills be caused by submerged UFOs? Either hitting the force field or the UFO itself, or by radiation or other emission from the craft?
Following this train of thought further, would benevolent ETs allow this to happen? Could negative ETs that work with the governments be assisting in destroying what they don't need? Zetatalk pushes the methane theory heavily, and it is highly suspected they work with the government, and the same ETs. Makes you go hmmm, doesn't it?
It escalated at the dawn of 2010, so it's been going on for almost four years, so a lot of damage has been done to the world's food supplies. Could it be the NWO is getting an assist in getting their agenda done, then they double cross the NWO folks and take over. So, there you go. I just created a new conspiracy theory. "Make of it what you will."
You can't blame any person, corporation, or government agency for methane burps due to earth movement or a magnetic pole shift. But all these other things, well, that's a different story. Seeing this bigger picture also neuters the climate-change theory that car emissions and cow farts are killing our planet. No, much, much more is killing our planet. And behind each one is a responsible party that probably wants to see the methane-burps-coming-from-earth-shifting-killing-birds-and-animals theory promoted vigorously to keep the real culprits in the shadows, well out of sight.
Here is a link that tracks bird/animal deaths since April 29, 2012: http://forums.thechaniproject.com/topic/3299-massive-animalmammalbirdfish-deaths-a-record/. As you can see, this is world-wide, not just in areas that are prone to methane burps. However, due to the timing (around 11:30 p.m. on New Year's Eve 2010, the Beebe, Arkansas, bird deaths could have been caused by fireworks as the birds showed signs of blunt force trauma. See, http://phys.org/news/2011-01-wisconsin-lab-blackbird-die-off.html .) Some of these die-offs do have other causes. In Australia in 2009, it was pesticides: http://www.desdemonadespair.net/2009/06/pesticide-causes-mass-bird-death-in.html. It was posited about the Arkansas bird and fish deaths at the dawn of 2011 that it could be the excess manure in that state from factory farming: http://underthemountainbunker.com/2011/01/03/could-animal-waste-from-factory-farming-be-the-cause-of-the-massive-bird-fish-deaths-in-arkansas/. That could make some serious methane.
This first came to national/world attention with the 5,000 bird die-off in Beebe, Arkansas, on New Year's Eve 2010. Here are some links to articles prior to the Chani Project list that starts April 29, 2012. After that date, they probably will overlap.
http://propheciesoftheendtimes.com/exhaustive-and-catastrophic-list-of-bird-fish-mammal-and-reptile-species-die-offs-since-jan-2010/ (since January 2010--this is a good list because it breaks it down by country)
http://www.mysterium.com/extinction.html (Mass extinctions were confirmed in the year 2000. So, it seems that this process of die-offs have been going on longer than frequently shifting earth and methane burps has been going on. In 2009, as discovered by me and confirmed by John DiNardo, earth shifting slowed significantly as witnessed in the decline of water mains breaking. He believes the cause was PX going below Jupiter and out of the direct line of fire towards Earth. I am noticing very few mass die-offs reported in 2009.)
In 2006, there was a die-off attributed to unusual weather: http://legacy.utsandiego.com/news/state/20060131-2009-globalwarming-birds.html.
Just some thoughts. Keep your eyes and minds open.