What is it important that carbon is recycled?

It's not so important that it be recycled ... after all, there's almost a limitless supply,
and there's no danger of ever running out of it.

What's important is to keep carbon out of the atmosphere.  In order to do that, we
need to reduce the amount of it that's released during so many of the processes
that we've been doing on a huge scale for the past 200 years, and invent ways
to capture the carbon that we DO continue to release, before it gets into the
atmosphere.

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The answer is b. hope this !