Totally agree that ecosystems are incredibly complex. Now, about geoengineering: would you agree that pumping up 1 cubic kilometer of buried fossil fuels every day, burning it to generate 1000 cubic kilometers of greenhouse gases dumped in the atmosphere has severe consequences for our system.... trying to partially offset these effects by reflecting back to the space part of the incident solar radiation does not seem so bad. Of course, the effects must be evaluated and there are lots of knowledgeable people with the tools to do this.