I&#x27;ve been following solar for around a decade now and have yet to consider it because of it&#x27;s long ROI. Sure, the technology has gotten more efficient as pointed out in the article, but a consumer&#x27;s up front costs have yet to come down.<p>I checked again last year about installing an array on my roof. My original outlay would be in the 30-40K range with an ROI of over ten years. If you want solar to take over the world and be a viable alternative to low income families, this isn&#x27;t going to cut it.<p>Also, does the author know there&#x27;s a limited amount of lithium in the world while his projections are pretty rosy for electric, the facts don&#x27;t seem to align with his assumptions:<p><i>William Tahil, the founder of Meridian International Research, a technology consultancy in Martainville, France, has argued that there simply isn’t enough economically recoverable lithium on the planet to support the auto industry’s ambitious plans. Tahil estimated that only 4.4 million tons of the world’s lithium resources can be extracted without prohibitive cost, a supply he believes will be quickly exhausted if lithium-ion batteries become a staple of next-generation cars.</i><p><a href="http:&#x2F;&#x2F;www.forbes.com&#x2F;forbes&#x2F;2008&#x2F;1124&#x2F;034.html" rel="nofollow">http:&#x2F;&#x2F;www.forbes.com&#x2F;forbes&#x2F;2008&#x2F;1124&#x2F;034.html</a><p>So why people are focusing on lithium to herald in the new electric car revolution, we should probably already be looking beyond electric cars as a viable long term solution.