Eusocialism begins with a consensus among the ruling elite of its necessity. This is the first stumbling block, and one unlikely to be overcome.
The first actionable step toward eusocialism is a notional seizure of all private assets, and a declaration of martial law to enforce it. No one owns anything, and no one is to do anything about contradicting that. The state, which now owns all, must judiciously take responsibility for all.
(Unprecedented throughout history owing to corruption and incompetence, such equitable governance is likely unattainable. Its only possibility lies in a core of competent leaders determined to brook no opposition, and able to persuade the populace of the goodness of such a visionary undertaking.)
In the initial transitional phase, regular business continues, with exceptions. The financial speculation industry is defunct. Those in this business are enlisted in administering eusocialism, as well as the army of civil-practice attorneys freed from their erstwhile work, as private property and taxes have been abolished.
Doubtlessly, the initial shock of a eusocialist revolution will require a large police presence in cities. Political leadership must be explicitly clear about how life is to proceed, and when death is to be dealt.
Initial resistance is expectable. There is nothing to be done but cull those who violently oppose the survival prospects of humanity with their greed and short-sightedness. The next generation, reared with proper education and the evidence of senseless human environmental impact still about them, should appreciate the discipline required to create a sustainable, equitable society.
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The first active focus should be helping those who need it most. Goodwill begins by taking care of the homeless, the underemployed, and those with medical problems.
An equally important process is educating the populace so that they understand the current predicament, and thereby enthusiastically come together. Unlike democracy, which may survive via apathy, mass support is crucial to the success of eusocialism.
Geographically, humanity must consolidate its presence on the planet and engender natural vegetation. Soils must be renewed, and forests allowed to regrow as much as possible. Return to Nature as much land as possible.
Current construction projects need to be quickly assessed for their value in the new society. Given inexorable rising sea levels, abandoning coastal areas is prudent. New construction should focus on sustainable communities in regions that may weather foreseeable climate change.
The economy must transition from the chaotic oversupply created by the market system to rational production and consumption. The economy is planned not for growth, but for sustainability.
Living becomes more communal. To minimize food waste, eating in restaurants becomes the norm.
Industries reliant upon fossil fuels – from power production to transportation – must be minimized as quickly as possible. Agriculture must be weaned of its fossil fuel dependence. The same holds for materials which are exceedingly polluting and energy intensive, such as cement and aluminum.
(There is an irony here. Rationalizing a society is going to require a lot of new construction, which necessarily will involve cement, since it is the most durable building material known. The same goes for other necessary materials which are not environmentally friendly. Note that pesticides is not one of them. Such toxins must be abolished.)
Given its environmental damage, restrict travel and destroy roads such that Nature may reclaim the land. With rare exception, eliminate personal transport vehicles. Build dense, vibrant cities with nearby industrial areas on land which cannot be farmed. Leave fertile lands to agriculture. Severely limit livestock production. Let rural areas and suburbs be reclaimed by Nature.
To have any hope of reducing the rate of environmental decimation, industrialization must be selectively dismantled. Technologies that are not environmentally sustainable must be abandoned. This necessitates technological regression. However clever human technologies may appear, they were not created with environmentalism in mind. If sustainability does not become a top priority, humanity will not survive.