We are trying to account for the emissions associated with “natural events” even if climate change is human-induced. The reporting requirements for the United Nations are narrowly focused on human emissions, so emissions from tailpipes and smokestacks, but we know, of course, that we're monitoring the concentrations in the atmosphere and we know very much that a lot of emissions are coming from events like forest fires and other things like volcanic eruptions. Some of those are human-induced and there is the possibility of a bit of a negative feedback loop, where warming causes release of methane or burning of forests, which then increases concentrations, which increases warming. These are the kinds of feedback loops that we are trying to avoid by reducing our emissions in the near term.
