Geo-engineering has about as much chance of gaining global acceptance as a global cap&#38;trade system : ie, none.  What will be interesting is if countries start experimenting with their own geo-engineering systems.  Will Micronesia sue, say, Canada for loss of tourist dollars if they cool things down too much by imitating a volcano and spraying sulphur dioxide into the stratosphere?<p>The most effective use of money with climate change is adaption when and where necessary.