I get it. But Americans almost always think that the year coming to a close is the worst. At the close of 2015, for example, Americans were asked” “Do you think the world is getting better or worse, or neither getting better nor worse?” Only 6 percent of those surveyed thought the world was getting better. The same low numbers were seen in 2000, 2005 and 2010.

Why do Americans have such a negative view? Many misunderstand how the world is changing or ignore positive change. Over the past decade, for example, extreme poverty across the world has declined tremendously. In 1981, 44 percent of the world lived in extreme poverty. By 2015, extreme poverty dropped to 10 percent. Yet, when Oxfam asked Americans how global extreme poverty is changing, the majority thought that extreme poverty was increasing. Only 8 percent were actually aware that extreme poverty is indeed falling.

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Other surveys find a similar lack of knowledge about positive developments. Crime rates have fallen for years in the United States, but year after year the majority of people believed crime was on the rise.

This lack of knowledge about how our world is changing is not a new phenomenon. Surveys from long before 2016 — the era before the world turned “post-factual” — show the same levels of ignorance.

There are several reasons for this. To start, the structure of the media means negative subjects are almost always being highlighted. Harm is done in an instant, and disasters are happening at once: an earthquake, a plane crash or a terrorist attack. In contrast to this, the best news for life on Earth — improving global health, falling poverty, environmental progress — are shaped by quiet trends over the course of decades or centuries. The focus on single events and neglect of slow developments selects negative news instead of often positive developments.

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In a classic essay from 1965, Johan Galtung analyzed the structure of news. He argued that the frequency with which outlets publish — daily, and now instantly — limits their ability to cover long-term positive trends. Imagine if newspapers did not come out every day but instead once every half-century. They likely wouldn’t report on half a century of gossip about celebrities and politicians. Instead, they’d focus on major global changes since the last edition. In a 50-year newspaper, the fact that global child mortality has fallen from 17 percent to 4 percent would make the front page.

The negative bias of event news is a problem on the supply side, but there are equally important problems on the demand side. In fact, to be on the lookout for signs of danger is hard-wired in our human psychology. Evolution has shaped our human nature to pay attention selectively and left us with a negativity bias because it is much more important for our survival to pay attention to threats than to positive changes. A missed opportunity is unfortunate, a missed danger can immediately threaten our survival.

What equipped us well for the life in small groups in our long past set us up with a mind that can lapse into a constant state of panic when exposed to the stream of 24-hours news. Even in a world of declining violence, on social media one can always find enough stories on violence, terror and possible threats.

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We can see how the media echoes what our human mind pays attention to: This week’s announcement of a successful development of a vaccine against Ebola was a footnote in much of the press and will not receive even a fraction of the attention the Ebola scare received when it dominated the news cycles for months.

An important reason that we are not aware of the slow developments that reshape our world is that we do not learn about them in our educational system. It should not be possible to make it through school without being taught how global living conditions have changed, but since this subject lies between mathematics (statistics) and history, it seems to fall through the cracks.

The consequence of this is that we have no knowledge about the poverty, poor health and the often high levels of violence that characterized our past. It is this ignorance that makes it possible to tell stories of decline, because it means that we are unaware of how inconceivably exceptional our current living conditions are from the perspective of our ancestors.

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The story that we tell about ourselves is the most important story of all. Journalists and intellectuals who almost exclusively focus on what goes wrong risks us losing our faith in one another, and that faith is the essential foundation without which our ideal of a free and democratic society is impossible. A constant supply of news that make us afraid with little to instill trust in one another and in our institutions has always been the best press demagogues can hope for.

Freedom is impossible without faith in free people, and if we are not aware of our history and produce and demand only the information on what goes wrong, we risk to lose faith in one another.