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  2. Open burning of waste - Wikipedia

    en.wikipedia.org/wiki/Open_burning_of_waste

    The United Nations has raised concerns about the amount of black carbon and methane produced from open burning as a method of waste disposal. [2] Many cities and regions suffer with air pollution and low air quality as a direct result of open burning of waste.

  3. Charcoal - Wikipedia

    en.wikipedia.org/wiki/Charcoal

    Charcoal Packaging of charcoal for export in Namibia. Charcoal is a lightweight black carbon residue produced by strongly heating wood (or other animal and plant materials) in minimal oxygen to remove all water and volatile constituents.

  4. Mata Pelajaran Umum - Wikipedia

    en.wikipedia.org/wiki/Mata_Pelajaran_Umum

    Mata Pelajaran Pengajian Umum (MPU, English: General Studies Subjects) is a pre-university qualification of general studies for private universities in Malaysia. It was formerly known as Mata Pelajaran Wajib (MPW).

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