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Straightforward answers to your questions about climate change.

Ask MIT Climate is here to answer your questions about how our planet is changing, how it will impact life on Earth and what we can do about it. Whether it's simple or sticky, about science or solutions, ask us! We work with MIT faculty and scientists to give you clear, no-nonsense answers grounded in the best scientific information. New answers posted every month.

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How many new trees would we need to offset our carbon emissions?

Because of the complexity of the carbon cycle, the answer is not obvious. What is obvious, MIT experts say, is that we should not only plant more trees but also put much more effort into protecting existing forests.
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