Like I said, there is a potential moral hazard with credits – companies think they can offset and continue emitting. Currently this is possible because carbon, in general, is still ridiculously inexpensive. Aggressive carbon taxes are ultimately what's going to bring down emissions.
Once economic constraints are in place, you still need to reduce carbon. And again, forests are one of the best ways to do this.
My problem with the article is that it's flippant towards carbon credits. It's highlighting problems with the current implementation, and using that to make a judgment about the whole idea of carbon credits.
We need a carbon tax, and we need better standards of accountability. These are solvable problems.