posted an update

If every online shopper used this chrome extension, we could offset 3 billion tons of carbon per year (~2 billion from e-commerce and ~1 billion from booking flights).

These numbers will only go up as the cost of carbon offsets decreases, the e-commerce industry grows, and more flights are booked. In less than 30 years, we could offset enough carbon to avoid catastrophic events due to global warming.

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