I do not see activity changes of that magnitude occurring on your graph — admittedly the period of coverage is limited to 30 years and is therefore a very small sampling. (climateaudit.org)
With intellectual changes of this magnitude taking place at a global level, there's a growing sense that we're approaching critical mass. (politics.co.uk)
Currently, the widespread scientific consensus is that global climate change of this magnitude has never occurred since the dawn of civilization. (dotearth.blogs.nytimes.com)