I expect that models will not only improve by better science and much better computing power (e.g. soil moisture, detailed topography, biomass), but they will also accurately predict which engineering solutions will have the desired effects. There is in climate, like in weather, a butterfly effect that the tipping point scare-mongers want to keep for their exclusive use. Once models are adequate we will see that small changes can have big positive results.
What we're up against is the notion that the present trend can lead nowhere but to ever-increasing levels; if you're not daunted by math, read this: http://www.hydrogen.co.uk/h2_now/journal/articles/2_global_warming.htm