There’s a certain irony in the fact that 2005, the year this study was published, was also the year when conventional petroleum production peaked; the transition would thus have had to begin in 1985
3 facts to check (are there any other facts to check?)
1. Report published 2005? Yes
2. Report stated something along lines of "the transition would have to begin twenty years before conventional petroleum production reached its peak and began to decline"?
Well report has two scenarios one starting 10 years before peak and one 20 years before peak and says
Initiating a mitigation crash program 10 years before world oil peaking helps
considerably but still leaves a liquid fuels shortfall roughly a decade after the
time that oil would have peaked.
3 2005, the year when conventional petroleum production peaked?
Unconventional petroleum has been growing so this from BP statistical review
Production*
Thousand barrels daily 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
World 77639 81054 82107 82593 82383 82955 81262 83296 84049 86204 86754
doesn't mean this is wrong. The report does state world oil production at just under 80 million barrels per day in 2003.
Searching every occurence of conventional did not lead me to a source for the level of unconventional rather than conventional. However assumption used include:
Under business-as-usual conditions assumed by the WEC, Venezuela
would have production of 6 MM bpd in 2030 -- 5.5 MM bpd beyond
production of 0.5 MM bpd in 2003
Current plans [for Canadian oil sand production] are for production of 3 MM bpd of synthetic crude oil from which refined fuels can be produced by 2030. This is above current production of
0.6 MM bpd.
Together with production figures
Canada 3003 3080 3041 3208 3290 3207 3202 3332 3515 3740 3948
Venezuela 2868 3305 3308 3336 3230 3222 3033 2838 2766 2643 2623
Seems to suggest that the actual increase of 4.647 MM bpd is unlikely to have been exceeded by increase in unconventional production. Therefore it seems that conventional oil likely did not peak in 2005.
Perhaps fracking should be counted as unconventional? US has increase in production of 2.45 MM bpd from 2010 to 2013. So if you think fracking should be considered unconventional peak conventional oil would be 2010 at the earliest rather than 2005. If report had known about fracking then it would have been regarded as one of its 'mitigation' strategies and the problem wouldn't have been seen as so serious. Of course using fracking in advance of peak reduces the effectiveness of this 'mitigation'.