Isn't the stakes of being wrong in the other direction (that global warming isn't happening) just as high?

Imagine if we spend billions/trillions of dollars trying to capture CO2, reduce oil consumption, etc. and it turns out CO2 wasn't the cause of global warming. That money could have done a lot of good if spent in other ways (i.e. lift millions of people out of poverty).

So we end up spending billions/trillions of dollars reducing consumption of nonrenewable resources and developing cleaner technology. What a waste.