Is this really right?

The makers of CFLs in Britain already use four tons a year of mercury
for their product. If and when the EU’s ban on normal bulbs comes into
force, there will soon be hundreds of tons of mercury in use, on the
market or ready to be put into landfill.

I have a feeling that it isn’t. CFLs have 5 milligrammes of mercury in them (that’s the max allowed under the new rules I think) so a billion of them will use 5 tonnes of mercury. I can’t see that becoming hundreds of tonnes really.