Damage to tropical rain forests is causing the extinction of many rain forest species, but it is also detrimental to human life. why?

Forests have lots of trees, trees clean the air by absorbing odors and pollutant gases (nitrogen, oxides, ammonia, sulfer dioxide, ozone, and carbon dioxide) and filter the air by trapping it in their leaves. When humans breath they take in oxygen with carbon dioxide but breath out carbon dioxide. Meaning less trees then less things cleaning the air.