of ecosystems to deliver services can be assessed by a variety of qualitative. and quantitative methods. An assessment of the condition of ecosystems, the provision of services, and. their relation to human well-being requires an integrated approach.
First proof of an human infected by HIV : 1959 Leopoldville, Congo. EVIDENCE FOR HUMAN INFECTION WITH AN HTLV III/LAV-LIKE VIRUS IN CENTRAL AFRICA, 1959 (Lancet-1986) (HTLVIII/LAV-like virus is the old name for HIV: HTLV-III) Genetic studies about HIV now estimates that HIV-1 appears on humans in Africa, probably few years before 1959.
The 1990s saw a substantial increase in the number of people infected with HIV and dying of AIDS. In 1997, almost 3.5 million people were diagnosed with HIV per year. After 1997, the number of new diagnoses began to decline and in 2015 it was reduced to 2.1 million per year. The number of AIDS-related deaths increased throughout the 1990s and reached a peak in 2004, 2005 when in both years 2 million people died.