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  2. 30 by 30 - Wikipedia

    en.wikipedia.org/wiki/30_by_30

    30 by 30 (or 30x30) is a worldwide initiative for governments to designate 30% of Earth's land and ocean area as protected areas by 2030. [1] [2] The target was proposed by a 2019 article in Science Advances , "A Global Deal for Nature: Guiding principles, milestones, and targets", highlighting the need for expanded nature conservation efforts ...

  3. Smallpox - Wikipedia

    en.wikipedia.org/wiki/Smallpox

    Smallpox was an infectious disease caused by variola virus (often called smallpox virus), which belongs to the genus Orthopoxvirus. [7] [11] The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, [10] making smallpox the only human disease ...