The paper represents a biological briefing of the author's travels through some tropical forests from an environmental perspective. It begins with the Romanian Trans-African Expedition, starting point of his biological journey, and arrives at the Costa Rican forest, trying to draw some parallels. At the same time, the presentation is a tiny tribute to tropical forests, so important in global climate regulation, but unfortunately underestimated and subordinated to immediate economic interests. The author's sincere thanks to the organizing team of this conference, because it gave him the opportunity to present the paper and to meet the former members of the Romanian Trans-African Expedition, a major action performed with enthusiasm and minimal financial expenses. [ABSTRACT FROM AUTHOR]