Fair question. Farming could benefit.  But infrastructure costs could increase with permafrost melting, increased flooding, coastal erosion...  More disease outbreaks in forests, and larger fires.  Fishing impacts from ocean acidification.  Answering those requires that we have the best information possible, right?

And of course economic considerations are only one value.  Not everything can be reduced to dollars and cents.  If most of our whales go extinct due to food chain collapse and toxic algae blooms, will our economy collapse?  Maybe not.  But I think the world would be a poorer place without them.  But that's just me.