Brazil and Colombia are the two most biologically diverse countries on Earth due to the Amazon rainforest. The Amazon is the largest rainforest in the world covering over a billion acres (stretching into parts of Ecuador, Peru and Venezuela as well).
Colombia lost 30% of their forests to diverse causes – ranging from logging, mining, development of hydro-electricity, agriculture to cocaine production. The primary cause of deforestation in the Brazilian Amazonas – like in Costa Rica – is cattle ranching.
The loss of tropical rain forests is a threat to wildlife worldwide with a profound effect on the global climate. (You knew that but it bears reminding.)