His main negative argument is about the Medieval Warm Period. (realclimate.org)
The Lightning Network is now live removing one of the big negative arguments about Bitcoin: lethargic speeds. (hacked.com)
Second, they can impose a rule of procedure that disqualifies purely negative argument, so that a theory which obtains some very modest degree of empirical support can become immune to disproof until and unless it is supplanted by a better naturalistic theory. (firstthings.com)