The press, as usual, is getting it wrong. But it is an important discovery anyway - that normal oxygen rich interactions have plants producing methane, rather than just as a bi-product of anoxic bacteria - shows that we have a great deal to learn about carbon's rich cycle, and cannot rely on hacks to simply sink the carbon. We have to face the fact that reducing carbon means reducing carbon input, not merely hoping to mop up.
So what does this study mean? Bottom line: we are going to have to remeasure how much carbon sinking trees do versus their methane output. We can't cut down tropical rain forests - they supply oxygen - but we can't simply believe that we can turn ashes back into wood to solve the Global Warming Problem.
[Yes, I'm an environmentalist, and global warming is a major deal. It's something that is in my writing, my economics and my music.]