What exact combustion is taking place in this video posted by a man from Quebec is unclear, but two things are certain: 1) This is awesome, and 2) You should never, ever do this at home. The world would be a simpler place if things that looked really badass weren't also likely to burn down your house, neighborhood, and/or regional forest, but alas, there it is. That's why you should do the responsible thing and only watch this video without ever replicating it.
If everyone who was going to explode their leaves, something most people were probably unaware of as a possibility until now, were to simply satisfy themselves with watching these Québécois blow up their back yard instead, these backwoodsman would probably be carbon-negative. Make it happen, Internet.