Environmental action can be taken relatively quickly when nation-state-level corporate interests aren't funding campaigns to oppose it. The premier example is the banning of CFCs in the 1980s in defense of the ozone layer:

"The discovery of the hole [over Antarctica] was evidence that the magnitude of the problem was far greater than scientists had originally predicted. International alarm at the ozone layer’s thinning led to unprecedented multilateral action to ban the dangerous chemicals that were responsible for its deterioration – chlorofluorocarbons (CFCs). By 1987, just two years after the hole was discovered, an international treaty was in place that cut the use of CFCs in half. Three years later in 1990, the Montreal Protocol was strengthened to ban the use of CFCs altogether in industrialised countries by the year 2000 and by the year 2010 in developing countries. Today, the use of CFCs is outlawed by 197 countries around the world and scientists concur that the ozone layer is slowly recovering as a result."

https://www.rapidtransition.org/stories/back-from-the-brink-...