Incinerators take recyclable materials such as paper and plastic to burn them and produce electricity. Landfill gas systems bury vegetables and kitchen waste, mixed with other kinds of waste, to produce methane and then electricity as well. In this way, these technologies actively compete with the valuable contribution of waste pickers to prevent catastrophic climate change as well as with general recycling programmes. Waste pickers and other recyclers offer much greater greenhouse gas reductions, especially when combined with biological treatment methods.