Sustainable Elections ?

Seems like a no brainer right ? Smart phones, computers and internet access are just about ubiquitous these days making all that wasted paper and fuel getting to and from polling booths seem unconscionable.  Online voting would not just be good for the environment it would make voting convenient and accessible for the public (consider the disabled and those living in remote areas) and cheap for the government. The main obstacles are security and user identification, but are they really insurmountable?  Online voting has already been adopted in Canada at a municipal level so lets hope the technology that enables it to happen on a federal scale is not far away.