An honest answer, thank you.
So again, I am faced with a question of who to believe, people who study climate for a living, or people who don't.
People who study it for a living seem to be fairly sure we are doing some harm, and having an increasingly large effect.
Over time we will get to see the effects first-hand, as I am fairly certain we will do next to nothing as a civilization to reign in CO2 emissions, so we are lurching along that path.
The real conservative, risk-avoiding strategy would be to take some moderate steps to avoid the potential very negative outcomes, especially as these steps, such as energy efficiency and renewable energy, offer some very tangible and plausible benefits outside the question of whether CO2 emissions are harmful.
The real question always comes back to "what to do about it?". Many would argue that our current course of action, i.e. nothing, is the best because we just don't know the risk of negative outcomes (although WC does put it at less than .00000001% probability due to his certainty about *his* calculations).
I find this reckless, and about as un-conservative as one can get, especially when the near-certain benefits of limiting CO2 emissions over time are weighed.