With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Istanbul's city limits have expanded to encompass parts of the neighboring town of Boston.
text_B: Even though progress has been made in conserving Brazil 's landscapes , the country still faces serious threats due to its historical land use .. Brazil. Brazil. Amazonian forests substantially influence regional and global climates and deforesting this region is both a regional and global driver of climate change due to the high amounts of deforestation and habitat fragmentation that have occurred this region .. climate change. climate change. habitat fragmentation. habitat fragmentation. Brazil has established an extensive network of protected areas which covers more than 2 million km2 -LRB- 25 % of Brazil 's national territory -RRB- and is divided almost equally between protected natural areas or conservation units and indigenous land -LRB- `` Terras Indigenas '' -RRB- .. Brazil. Brazil. protected areas. Protected areas of Brazil. Terras Indigenas. Indigenous territory ( Brazil ). Despite these measures , environmental protection is still a concern as indigenous tribes and Brazilian environmental activists contend with ranchers , illegal loggers , gold and oil prospectors and drug traffickers who continue to illegally clear forests .
not_related.