The main points are
1) it's the only long term solution for our nation. That doesn't mean my lifetime or yours, I'm talking generations. The faster we do it, and do it well, the faster we become a world leader in exporting that tech.
2) It makes our nation more secure for a number of reasons.
a) not being dependent on the most volatile region in the world for control of a market monopoly. Yes we have significant reserves in case crap goes down, but the average day in America is greatly effected by the petrol market.
b) if we are able to export this tech to poor nations that might be a potential source of conflict it will stabilize them in long term ways (I'm thinking the ability to make clean water as an example since de-sal takes so much power).
c) while it may suck for the people who are affected by "energy poverty" now, the long term stability of renewables makes the US more domestically secure.
3) Building off 2C, this is a necessary spring board for our economy to develop. If done right it provides near generations massive job opportunities for the rebuilding of our infrastructure and creates lasting manufacturing jobs as green production components will be in long term demand and later demand for maintenance items. Unlike petrol that is trying to find new ways to reinvent itself (fracking), greener energy is a power source that is only going to get more efficient. As it does, we'll constantly have to update in a strong linear process rather than the chaotic process of petrol development. Risks like train derailments vaporizing a town, supply interruptions because of international issues, all but disappear.
4) The environment is at a tipping point. We've seen all the scientific data, none of which can be reasonable denied. The more time passes the more it's accelerating, especially as we learn about how the naturally balanced system of carbon sinks are being affected (think methane sequestration in tundra as one example). This news about ethane coming from fracking just shows that that technology is not a long term solution to our energy needs. But more local to our generation, petrol based energy is rough ridin' filthy. Even if you don't prescribe to man made global warming, we know that petrol energy is a huge risk to our immediate environment. From Deep Water Horizon, Exxon Valdez, Lac-Mégantic disaster, or even the impact in the Tar Sands, the risk to our world in the immediate sense is stupendous. If we go green now, we have an immediate positive impact on our environment outside of the global warming debate.
link to fracking/ethane point
http://www.futurity.org/bakken-formation-fracking-ethane-1149132-2/