The estimates of the just how much oil is spewing into the Gulf of Mexico from BP’s Deepwater Horizon rig keep rising. The latest guess — and it is just a guess — is something like 210,000 gallons a day. It is almost certainly going to eclipse the Exxon Valdez catastrophe by the time things are brought under control. Who knows how much damage has been done to the Gulf Coast ecology and economy? But could it be that we’re lucky this happened where and when it did, instead of a few years down the road in an even more difficult spot, say the Arctic Ocean?