if you try to look at compensation right for these things then I think in the terms of climate engineering things are going to be a lot more complicated than for climate change because if you were

looking at specific climate events for example you know a failure of the moon soon to arise it's very hard to make a

statement about the question to what extent this event was unambiguously caused by this intervention this statement will almost never be possible but I think what we can do and I think there's important progress in the employment science I think we can make some statement about to what extent this event is attributable to this intervention how likely is it that this

event would not have occurred now in the absence of this and this gives us some

amount of a true total share so my hope

would be that within the next 10 to 15

years we're going to have a methodology that would enable us to do these things much better their attempts to do this in hindsight now if you think about the heat wave in Europe they kind of happened in the 2003 for example people have been going out and trying to make some statements what extent that heat wave could be attributed to a natural variation the climate as has been happening for hundreds of years which would have been happening irrespective of climate change or not and the extent to which we can attribute it to climate change and to purge any climate change in particular and and I think this methodology holds a lot of promise where we can say well you know probably to 45 percent or 85 percent you can hold climate change and to purge any climate change responsible for this heat wave so these types of statements will become more and more possible with better better analysis