There are numerous answers to this question because it is largely subjective. Personally, I would consider inventions in the transportation sector to be some of the best inventions concerning environmental issues. Subways, for example, are used heavily in many countries. How many cars has this prevented from being put on the road? Bicycles as well are a huge pillar in the history of environmentally friendly inventions. While ridership in the USA is generally low, other countries ride bicycles at a much higher rate. Bicycles are extremely efficient and produce no emissions while riding.
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