It will not do to say that it’s enough for the planners to approximate the optimal plan, with some dark asides about the imperfections of actually-existing capitalism thrown into the mix. The computational complexity formula I quoted above already allows for only needing to come close to the optimum. Worse, the complexity depends only very slowly, logarithmically, on the approximation to the optimum, so accepting a bit more slop buys us only a very slight savings in computation time. (The optimistic spin is that if we can do the calculations at all, we can come quite close to the optimum.) This route is blocked.
In recent years, Brazil has improved its environmental legislation and several initiatives were put in place to combat climate change, which has led to significant emission reductions. The Amazon Region Protected Areas Program (ARPA) encompasses 60 million hectares of protected areas and the estimated impact of ARPA alone will prevent the emission of 430 million tons of carbon by 2030. Another example is the Marine Protected Areas Program – a pioneer initiative that is expected to triple marine protected areas along Brazil's coast.
A third serious setback was Egypt. The collapse of Hosni Mubarak’s regime in 2011, amid giant protests, raised hopes that democracy would spread in the Middle East. But the euphoria soon turned to despair. Egypt’s ensuing elections were won not by liberal activists (who were hopelessly divided into a myriad of Pythonesque parties) but by Muhammad Morsi’s Muslim Brotherhood. Mr Morsi treated democracy as a winner-takes-all system, packing the state with Brothers, granting himself almost unlimited powers and creating an upper house with a permanent Islamic majority. In July 2013 the army stepped in, arresting Egypt’s first democratically elected president, imprisoning leading members of the Brotherhood and killing hundreds of demonstrators. Along with war in Syria and anarchy in Libya, this has dashed the hope that the Arab spring would lead to a flowering of democracy across the Middle East.