Post-modernity spans 1945 to 2016 C.E., an era defined by rapid technological acceleration, decolonization, the rise of the internet, and expanding civil rights. This archive collects milestones in science, medicine, governance, and culture from those seven decades of sweeping human progress.
Seattle pushed back high school start times in November 2015, moving secondary students to an 8:45 a.m. bell across a district of roughly 52,000. The shift grew from three years of advocacy by a biology teacher, pediatric sleep specialists, and parents, and helped pave the way for California’s statewide later-start law in 2019.
The Sustainable Development Goals were adopted on September 25, 2015, when 193 nations gathered at UN headquarters in New York and agreed to a shared 15-year plan spanning poverty, climate, and equality. More than 8 million people helped shape priorities through the MY World survey. It remains the broadest development framework humanity has ever attempted together.
The Suva Declaration on Climate Change, signed by Pacific Island leaders in Fiji in 2015, was the first time national governments formally called for a halt to new fossil fuel extraction. Nations like Tuvalu, sitting less than two meters above sea level, named the source of the crisis directly. It helped seed a decade of supply-side climate diplomacy.
High seas protection took a real step forward in 2015, when every U.N. member state agreed by consensus to begin negotiating a legally binding treaty for the open ocean. The waters beyond national borders cover more than 60 percent of the sea, yet had long lacked meaningful rules. This resolution opened the door.
Ireland legalized same-sex marriage by popular vote on May 22, 2015, becoming the first country to enshrine it through a national referendum. More than 1.2 million voters said yes, with only one of the country’s constituencies returning a No majority. In a nation where divorce had been illegal two decades earlier, citizens rewrote their own constitution.
France’s green roof law, passed by Parliament in 2015, made the country one of the first to require new commercial buildings to top their roofs with either living vegetation or solar panels. The mandate was a compromise, narrower than activists hoped, but it turned ecological rooftop design from a nice idea into a national baseline.
Solar power took over a major airport in 2015, when Cochin International in Kerala, India became the first in the world to run entirely on the sun. More than 46,000 panels spread across 45 acres of former cargo land now meet all the airport’s needs, with surplus flowing back to the state grid — an early proof that big infrastructure could go fully renewable.
Extreme poverty fell below 10% of the global population for the first time in 2015, according to World Bank projections. Roughly 200 million fewer people were living on less than $1.90 a day compared to just three years earlier. For most of human history, mass poverty was simply the default — and that was quietly starting to change.
In 2015, the National Cancer Institute quietly updated its website to acknowledge something new: cannabis has been shown to kill cancer cells in the lab. The agency pointed to preclinical studies where cannabinoids triggered tumor cell death in mice and rats. A small sentence, but the first time federal science openly met the research.
America’s first offshore wind farm came to life in 2015, when construction began on five turbines in the Atlantic waters off Block Island, Rhode Island. A 21-mile submarine cable eventually linked the island to the mainland grid, replacing its diesel generators. Small in scale, it proved offshore wind was buildable in U.S. waters.
