During the 1990s, some settlement projects had grown large enough that needed a centre or administration nearby. Between 1988 and 1997, the number of municipalities in the Amazon increased dramatically. Dr. Alfredo Homma analysed this increase of municipalities in relation to deforestation in his book Historia da Agricultura na Amazonia (2003). A municipality requires road extension within its territory and building of an administrative centre. Families of the early settlers grow, or others arrive from outside to join them, and the population grows, putting further pressure on surrounding forests.
When the so-called social-environmentalist approaches were taken after Rio Summit in 1992, these settlers were encouraged to sustainably conduct their agriculture in the Amazon. The family farming credit schemes enabled "associativism" among the small and medium sized farmers to collectively learn the sustainable use of the land. Both national and international NGOs deployed various sustainable agricultural and business projects, targeting new associations and cooperatives, and the government largely supported these projects. Though in a pilot scale, municipalities were also directly encouraged to engage in sustainable forest management such as in the green municipality project of the International Centre for Forestry Research (CIFOR).
However, this associativism-based social-environmentalism changed in the late 2000s, when agrobusinesses (owned by external companies and by earlier settlers expanding their ranches and farms) started to expand in these settlement projects-based municipalities. Large agribusinesses set aside forest reserves, following environmental regulations at the time (leaving 80% of a new property as forest) while taking family farmers' land or labour as their properties. The deforestation and forest burning rates dropped because of this land property concentration, marginalization and proletarianization of family farmers. This was especially evident in soy frontiers in the southwestern to central fringes of the Amazon.
The municipalities that are allowing most forest burning to take place today coincide with such agribusiness frontiers, including Novo Progresso, Altamira, Sao Felix do Xingu or Itaituba in Para state. The constituents of these municipalities dominantly voted for Bolsonaro in 2018 in the first round by at least 60%. These voters are those who had gotten tired of being environmentally correct or being unable to encroach further into the forest, as their forefathers did, in order to establish new lands for their own use. They are perhaps also fiercely evangelical, believing in virtues of working on the land without knowing much about environmental stewardship as more conventional pastoral movements in Brazil taught in the countryside.