More than two decades ago, the world agreed on the need to confront climate change.
The U.N. Framework Convention on Climate Change (UNFCCC) emerged in 1992, spawning a variety of negotiating forums with the goal of preventing catastrophic impacts from planetary warming caused mostly by polluting societies.
It's easy to overlook the progress that has occurred since, because we still have so far to go. Droughts, flooding and cyclones that already seem to be the norm are just the latest warnings of what is coming, and preventing much worse requires immediate and aggressive action to drastically reduce greenhouse-gas emissions.