Our Sun will not go Boom, it does not have enough mass. When it burns off enough mass it will expand into a red giant, and then later compress into a white dwarf. And when it expands, it's expected to expand out about 1 AU (the Earth's distance to the sun. However, in the 5 billion years when this happens, the Earth is suspected to be about 1.7 AU away from the Sun.
Our Sun would need to be 1.4 times the mass it is for it to explode (Chandrasekhar limit). And even then, we might as well do something in the mean time. To say that it won't be an issue is a bit premature.
I'm not sure what you mean by "burning the heavier elements" because the Sun is overwhelmingly made up of hydrogen. In fact, the sun will expand because it will have burned off enough mass through the fusion of hydrogen (the lightest element), and eventually when enough of the mass has been released via radiation, there will not be enough gravitational force to counteract the expansive force that the fusion reaction has. And by the time this happens, the only planets expected to be pooched are Mercury and Venus. But the sun's mass is about 71% hydrogen, and 21% helium (a byproduct of hydrogen fusion). While a spectrum analysis has shown other elements as well, none of them are believed to make up more than even 1% of the Sun's mass, though Oxygen is close.
I think he was referring to it being the point of no return.
How exactly have we passed the point of no return, when the article you referenced comments about how the Peat Bogs of Siberia didn't exist 11,000 years ago. Prior to that, the methane gas would have still been released into the atmosphere, and it probably still would have been wet so that it wouldn't oxidize.
Though at the same time, you're the exact same person that said people were essentially stupid simply because they were Muslim, so I'm thinking people should take your comments with an exceptional grain of salt. Especially when you toss out such gems as "You believe in God don't you. I can tell" in this thread, I'm not so sure you should be the one insulting people in this thread.