The 30th Conference of the Parties (COP 30) of the United Nations Framework Convention on Climate Change will be held in November 2025 in Belém, in the Brazilian Amazon. For COP 30 to be effective in leading the world to reverse its disastrous course toward a climate tipping point, it will be necessary not only to halt deforestation but also to facilitate a rapid worldwide phaseout of fossil-fuel combustion. Yet as host of the conference, Brazil is not leading by example. As participants prepare for COP 30 over the months ahead, it is important that the meeting be used not only to agree on further global measures to combat climate change, but also to encourage the host country to change current practices.