This article would be much more concerning if it was titled 'Google claims the IRS can read your email without a warrant.' The IRS can think whatever it pleases about accessing your email, however it still needs your provider to cooperate and turn over your email without a warrant.

Google's stance on this particular issue is actually quite the opposite of the IRS's: http://www.wired.com/threatlevel/2013/01/google-says-get-a-w...