I read that biodegradable waste in landfills produces methane, a harmful GHG. But didn't biodegradable waste always exist? We throw paper away, but the trees we produce paper from would have died eventually. Our organic waste comes from plants and animals that would have died eventually too. So wouldn't they have produced methane anyway? What difference does our contribution in landfills make? People say composting is environmentally friendly, but isn't it the same? Also, what about waste to energy incineration? How do composting, landfills, and WtE compare in terms of GHG emissions?