хатуу карбидын эцсийн тээрэм хятад
алхны тээрэм бутлагч дээр ppt. PowerPoint Presentation. Let''s Talk Plastic Free plastic bags are too expensive United States uses 100 billion plastic bags per year: = 12 million barrels of petroleum or 504 million gallons = $4 billion/year cost passed onto consumers 13 bags = petroleum to drive 1 mile Plastic bags take 400 – 1,000 years to biodegrade Less …