[nik-]

First we need to define what "there" is. Is "there" our current energy demands completely replaced by renewables? 80% replaced? 60%?

If it's fully, then no, we won't get there in our lifetimes. I don't think 80% either. 60%? Now we're talking attainable.

I fully believe that the replacement of fossil fuels for electricity generation is fully possible in our lifetimes. This is what the government should be pushing and it would be a massive impact. Unfortunately for some environmentalists, this means nuclear. The fear of nuclear has to be eliminated.

As far as transportation. Once the energy that supplies the batteries power is green, electric cars will actually be green. Manufacturers and consumers will take care of that switch without government intervention. It will take a little time, but will happen naturally.

Planes and Shipping. I don't see it changing in our lifetimes.