The world is approaching a climate tipping point, where change may become difficult to reverse. Limiting temperature increases to 1.5 degrees Celsius above preindustrial levels, and well below 2 degrees, is the goal of the Paris Agreement. Yet 2024 was the hottest year on record, with temperatures rising over 1.5 degrees, after a decade of the warmest weather on record and more frequent and extreme weather.
To meet Paris climate targets, global emissions would need to be reduced by 43 percent by 2030 to reach net zero by 2050, requiring a transformation of global energy systems. At present, global greenhouse gas emissions have reached record levels, with total carbon dioxide emissions in 2024 projected at 41.6b metric tons. Though renewable energy is growing at exponential rates—by 415 percent since 2000—its share of total world energy consumption is still only 13 percent, which the International Energy Agency forecasts to grow to 20 percent by 2030. Fossil fuels account for about 82 percent of energy consumption and are flat, not significantly declining.
This paradox of sustained fossil fuel use amid soaring renewable investment—two-thirds of some US$3t in global energy investment in 2024—is epitomised by China, which accounts for 40 percent of the world’s deployed renewable energy and 60 percent of the world’s EV sales yet has built more than 1,000 gigawatts in coal power capacity since 2000. By 2050, when Paris adherents pledge net-zero emissions, fossil fuels are projected to be in use, though reduced by some 50 percent.
This helps explain why efforts at the most recent U.N. climate meeting in Azerbaijan, known as COP29, to agree on a timeline to phase out fossil fuels failed. China, the United States, India, the European Union, Russia, and Brazil together account for nearly two-thirds of current yearly emissions—and deciding how to divide current and historical responsibilities is a complex diplomatic issue.
Trends suggest deepening risk: The new US administration will promote fossil fuels and roll back U.S. climate commitments, and new energy demands from data centers and cryptocurrencies will increase the damage. The US exit from the Paris Agreement, as per 2015, will pose challenges over COP 30 in Brazil.
Expectations for COP30, which will be held in Belém, Brazil, included a significant push for further climate finance commitments, particularly towards developing countries, concrete steps to align Nationally Determined Contributions (NDCs) with the Paris Agreement goals, addressing outstanding issues from COP29, and a stronger focus on climate justice, particularly concerning the needs of indigenous and vulnerable communities impacted by climate change, with Brazil aiming to lead these discussions as the host nation.
The US move adds to challenges Brazil was already set to face as COP30 host, including tough disputes over financing the energy transition in developing countries and the new pledges to reduce emissions countries have vowed to make.