100% renewable is just not possible. Aircraft, trains, and ships will continue to require more energy than can be provided by renewable sources. It'd really suck if your batteries died halfway to Australia.
In Germany, the transition to 100% renewable power is being impeded by insufficient transmission and distribution capacities. As nuclear power plants are retired, the providers of conventional power in neighboring countries could respond more quickly to the ensuing electricity supply gap, particularly in Bavaria. See my recent article on this prospect at Energy Post. http://energypost.eu/energiewende-running-limits/
Why wait until 2050 since the matter is "the greatest threat" now to the planet and all its species? Such target dates only gives the governing bodies permission to delay drastically needed actions.
By 2050 there will have been terrible consequences for not having taken actions already long overdue.
According to scientists by 2050 the human species and numerous other species will have been nearly wiped out and the need for energy sources renewable or non-renewable will have been greatly diminished.
"We cannot afford to have an energy divide and create energy ghettos", meanwhile we are divided into 450+ organizations under one important issue. United we stand or divided we fall. It is time to come together in fact, in order to be strong together.
Why don't all these diverse organizations and groups join forces with the one group that has a proven plan to get us to a clean-energy economy within the next decade at no cost to consumers or taxpayers and no problems for conservatives because it uses market forces rather than government regulations, expenditure or expansion: The Citizens Climate Lobby.