This is an excellent idea. It is such a good idea that I propose that all populations of geese should be culled on a regular basis whether they are wild populations or introduced ones.
Water purity must be maintained and if relatively small numbers of geese can impose such a severe strain on the eco-system they must be killed worldwide.
What about the increase in avocet numbers, little egrets, spoonbills. Vast amounts of excrement putting pressure on water quality. It may seem paradoxical but if the only way to preserve the eco-system is the culling of avocets then the RSPB should lead the way. We must lead by example and not be led by sentiment.
Are John, might have known you'd get involved here! The difference between Avocets, Little Egrets and Spoonbills is that they may not move nutrients from one system to another in the same way, they spend their time in the water so there should be no net change. The Geese are feeding in fields and then roosting and crapping in the lakes, thus adding nutrients into the system. In fact the long-legged wading birds probably crap a lot outside of the areas that they feed and may be a net drain on nutrients into freshwater systems...