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Representatives from all over the world are currently meeting on the edge of the Amazon rainforest in Belem, Brazil, to try and advance the global transition away from fossil fuels.
The occasion is this year’s annual United Nations climate summit, known as COP30. One decade ago, the conference produced the landmark Paris Agreement to limit global warming to 1.5 degrees Celsius, compared with preindustrial levels.
Today, that 1.5°C target is essentially impossible to meet, and the world is nowhere near on track to achieve the U.N.’s goal of net-zero emissions by 2050. Even keeping warming below 2°C is a long shot. New estimates from the Rhodium Group suggest we’re on track for between 2°C and 3.7°C of warming by the end of the century, with 2.8°C being the average outcome. Those figures would exacerbate extreme weather that has already worsened in recent years with far less warming.
It’s a bleak picture. But here’s the other way of looking at it, one emphasized by Bill Gates in a controversial treatise on climate released ahead of COP30: Today’s worst-case warming forecasts are far less bad than what was once predicted. Before the Paris Agreement was set, the U.N. Intergovernmental Panel on Climate Change forecast global temperatures would rise by 2.5°C to 7.8°C by 2100.
The reason warming is now on a better — if not good — trajectory comes down to the remarkable rise of renewable energy.
Solar, wind, and batteries have gotten extremely cheap. Alongside natural gas, which emits less carbon dioxide than coal, these clean sources have surged onto the grid in recent years and helped displace fossil fuels. Rhodium forecasts that at our current rate, global power-sector emissions will fall by more than half by 2050. Because the power sector is currently the world’s second-largest source of greenhouse gases, per the research group, that could be enough to bend the curve on overall emissions.
Despite this progress, the line of actual, recorded emissions continues to tick up. This year’s COP comes amid global backpedaling on climate commitments and countless calls for a new, affordability-focused approach to the energy transition that proponents say is more pragmatic. The U.S. government, meanwhile, declined to even send a delegation to the event. (Trump administration officials had no problem carving out time to hawk natural gas to the European Union in Athens, Greece, last week.)
These headwinds underscore an important fact: A sustained decline in planet-warming pollution remains only a possibility, one that is likelier now than it was before but still not guaranteed.
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