Do we go for a big fix for reducing carbon dioxide?

At what point, if ever, do we say that the risks from climate change are so high it is worth the risk of trying human intervention on a massive scale? We do not have a very good record when it comes to our tampering with nature. Introduced predators get out of hand, coral reefs made from tyres disintegrate. We just don't understand the natural world well enough to know what the side effects will be. But at some point will it be worth the risk?

He is a possible solution on a grand scale, increasing alkalinity of the oceans by accelerating natural weathering: http://www.physorg.com/news113637002.html

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