GE is Serious Though
His Article In the Atlantic Way more serious than the blip EP linked to. Still lacking in technical merit in a few areas though. The "far more NEOs than thought" is not supported by data for objects larger than 1 km and I didn't see a link where he got that idea from. When NASA started they thought there were between 800 and 1200 NEO's larger than 1 km. The estimate has gone up and down, but generally stayed in that range. As noted at JPL's site a recent change in the estimate of average albedo caused them to revise their tracking data.
Regards,
Mark