In december 2015, in Paris, global world leaders agreed on radical policies to curb CO2 emissions and minimize global warming and climate change. Not only were norms for factories tightened considerably, and taxes on airfares tripled, but there was also a large-scale campaign to change consumer mentality, and encourage people to repair instead of replace their broken appliances.
This caused a drastic reduction in emissions, as well as overall polution. The economy wobbled for a few years, before it stablized again, mainly due to switching from physical, pollution-heavy products to software and data as its main currency.
During the next couple of decades, nothing much happened. Which was the whole point, really.