You'd probably have to employ very very very tough stances. Apart from the rezoning to farmland, to make it even more difficult for development, perhaps the government have to buy over say 2 mi of farmland all around the city so as to force an artificial UGB around the city, disallow all form of developments within this and beyond this UGB. This is what the UK employed which renders all farmland almost useless for development (by this I only meant the farmland zoning prohibition, not the purchase of land). Ensure that your Council, State and Federal Governments are OK with this - if there are any appeals that go all the way up - and reject all applications for developments beyond this boundary.
As to what is currently within the city, consider a 'staged' development plan whereby you set timelines for redevelopment of specific areas.
Implement a 'sprawl' and 'car use' tax that taxes people and developers on the greenhouse gas emissions created because of car use and the encouragement of car use.
Whether all of this are acceptable politically is another issue altogether. Our plain laziness, culture and financial profitability ensure that trends are moving towards sprawl and car use, despite people talking about being 'green'. If you really want to do something about it immediately, the only way politically around it is to have a totalitarian political system, which will not work in the US' context (and beyond).



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