Answer:
Because, if we do not, plastic can kill the environment, which in turn makes Earth impossible to live on.
Step-by-step explanation:
"Reducing the use of plastic is important because plastic production requires an enormous amount of energy and resources. This causes carbon emissions and contributes to global warming.
Recycling plastic is not efficient – only 9% of plastic ever produced has been recycled. About 60% is discarded in landfills and oceans. There, it stays for thousands of years, transforming into 'microplastic,' leaching into our water supplies and food."
- A science text I found
I hope I could help!