Obviously, with 2 ppm (or so) of annual growth, the idea of 350 ppm is absurd without a change in pollution patterns.
To start to make a 180 degree turn, unless one is an amazing stunt person, the most sensible first step is to start slowing down.
Energy Efficiency, Energy Conservation, Renewable Energy, ...
The Three Rs: Reduce use; Renewable Power; Remediate for polluting use. And, we're going to have to be doing a lot of remediation for past pollution. Blogging regularly at Get Energy Smart. NOW!!!