Hunger and poverty continue to be persistent challenges for all of humanity even in this twenty-first century. In addition to causing immense suffering, they undermine development and global stability, with repercussions for public health, inequalities, climate action, and democracy itself. We are losing this battle. Progress in the implementation of Sustainable Development Goals 1 (no poverty) and 2 (zero hunger) is slowing down or, in some cases, regressing. Most low-income countries, and many middle-income countries, do not have social protection policies. When they exist, high indebtedness and tight fiscal space limit their proper operation. International financing mechanisms are fragmented, hard to scale, and burdened with high transaction costs. The available instruments are insufficient to set the world back on the path to zero hunger and the eradication of poverty. Global challenges like these require a more ambitious and more effective commitment, with financing and action at all levels. Brazil has a historical commitment to the eradication of hunger and poverty through the design and implementation of evidence-based public policies, such as Bolsa Família and the Food Procurement Program (PAA). Other countries, from both the Global South and the North, have developed innovative approaches to fight hunger and poverty. We can all learn from each other. Determined to contribute to addressing these scourges that afflict our societies, Brazil decided to place the establishment of a Global Alliance against Hunger and Poverty among the priorities of its G20 presidency. The Alliance has two main objectives. The first is to provide sustained political momentum and foster collective action, building synergies with other existing efforts to combat hunger and poverty. In a divided world, we need more unity. The Alliance will also facilitate and mobilize domestic and international financial resources, as well as knowledge, to enable large-scale implementation of public policies. The process will be led by the countries that request cooperation, especially those most affected by hunger and extreme poverty.