Question

history of plastics identify key dates in the history of plastics. mark them on the timeline and provide a brief explanation for each event. annotate your timeline to recall three negative impacts that have arisen over this time. 1855 1900 1950 2000 2025

Explanation:

1. Timeline Key Dates & Events:

• 1869: John Wesley Hyatt invents celluloid, the first commercial plastic, as an ivory substitute for billiard balls.
• 1907: Leo Baekeland creates Bakelite, the first fully synthetic plastic, heat-resistant and moldable for industrial uses.
• 1950s: Mass production of polyethylene, polypropylene, and PVC booms, making plastics ubiquitous in consumer goods.
• 2000s: Global plastic production surpasses 200 million tons annually, with single-use plastics dominating markets.

1. Negative Impacts:

• Marine Pollution: Plastics break down into microplastics, accumulating in oceans, harming marine life and entering the food chain.
• Resource Depletion: Most plastics are made from fossil fuels, accelerating non-renewable resource consumption.
• Toxicity: Plastic production and leaching of chemicals (like BPA) pose risks to human health and ecosystem health.

Answer:

Timeline (Marked Key Dates):

Date	Event
1907	Creation of Bakelite (first synthetic plastic)
1950	Mass production of modern plastics begins
2000	Global plastic production exceeds 200M tons/year

Three Negative Impacts:

1. Marine ecosystem harm from plastic/microplastic accumulation
2. Accelerated fossil fuel resource depletion
3. Human and environmental health risks from toxic plastic chemicals