Could we ever pull enough carbon out of the atmosphere to stop climate change?

Nature has equipped Earth with several giant “sponges,” or carbon sinks, that can help humans battle climate change. These natural sponges, as well as human-made ones, can sop up carbon, effectively removing it from the atmosphere. 

But what does this sci-fi-like act really entail? And how much will it actually take — and cost — to make a difference and slow climate change

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