The outlook is based on MIT\u2019s Integrated Global Systems Model, which links population growth, economic activity, energy use and international policy decisions to changes in the climate system. The United Nations Framework Convention on Climate Change has described it as \u201ca comprehensive tool built to analyze interactions among humans and the climate system.\u201d<\/p>\n
\u201cThe current trends are very concerning,\u201d said Sergey Paltsev, co-author of the \u201cGlobal Change Outlook\u201d and deputy director of MIT\u2019s Center for Sustainability Science and Strategy<\/a>. \u201cWe are nowhere near the stated goals of the Paris Agreement.\u201d<\/p>\n Under current trends, the model projects a rapid expansion of renewable energy, led by wind and solar, with renewables supplying more than 70 percent of global electricity by 2050\u2014up from roughly 40 percent today. It also finds that, despite U.S. efforts to revive the coal industry, global coal consumption is expected to continue declining.<\/p>\n Those gains from renewable energy are largely offset by ongoing economic and population growth. Global greenhouse gas emissions are expected to rise until around 2030, driven primarily by growth in developing countries, while emissions in developed nations, as well as in China and India, remain largely stagnant. Much of this increase comes from continued use of liquid fuels and natural gas. Between 2030 and 2050, emissions are projected to decline slowly, only to rise again later in the century, partly due to agricultural emissions linked to population growth.<\/p>\n With no significant emissions reductions on the horizon, the model projects global temperatures are likely to surpass 1.5 \u202fdegrees Celsius within the next few years, reach roughly 1.8\u202fdegrees\u00a0 by 2050, and approach 3\u202fdegrees by 2100. These projections represent the model\u2019s \u201cmiddle of the road path,\u201d or most likely outcome. Across hundreds of simulations, some outcomes show far greater warming, while others fall below that central estimate.\u00a0<\/p>\n \u201cThe findings align with other models and with my own modeling from about a decade ago,\u201d said Ross Salawitch, an atmospheric researcher and climate modeler at the University of Maryland. According to Salawitch, political challenges and energy demand exceeding early projections explain why emissions reductions are not yet clearly reflected in current long-term projections.<\/p>\n More recent independent analyses point to similar outcomes. Rhodium Group estimates \u201cmiddle-of-the-road\u201d warming of about 2.7 degrees by century\u2019s end, while Climate Action Tracker projects 2.5 degrees to 2.9 degrees, depending on future policy.<\/p>\n Keeping global warming below 1.5 degrees has long been a central goal of the international climate framework. Exceeding the threshold risks triggering critical tipping points and causing irreversible damage. The Paris goal of 1.5 degrees is a global average that masks regional extremes that are, in some cases, two to three times larger, meaning many places experience average warming of 3 degrees to 4.5 degrees Celsius (5.4 degrees Fahrenheit to 8.1 degrees Fahrenheit).\u00a0<\/p>\n The European Union\u2019s Copernicus Climate Change Service report released last week ranked 2025 as the third-warmest year on record, just a hair cooler than 2023 and within striking distance of 2024, the hottest year on record. Together, the past three years averaged more than 1.5 degrees Celsius <\/a>above pre-industrial temperatures, the first time any three-year stretch has crossed that threshold.<\/p>\n \u201cAny increase in temperature is an indication that the global system is taking on more energy,\u201d said Adam Schlosser, co-author of the \u201cGlobal Change Outlook\u201d and deputy director at MIT\u2019s Center for Sustainability Science and Strategy. \u201cThat energy has to go somewhere and it shows up as more intense and\/or frequent extreme events.\u201d<\/p>\n In addition to fueling deadly heat waves that already kill over half a million people each year<\/a>, rising global temperatures are projected to intensify extreme weather, make precipitation more erratic, increase the risk of drought and disrupt agricultural production worldwide. The outlook warns these shifts would also accelerate biodiversity loss.<\/p>\n Despite the grim outlook, there is still reason for hope. The report also outlines \u201caccelerated actions\u201d\u2014projections of emissions and climate outcomes if strong economic and policy commitments are implemented.<\/p>\n This story is funded by readers like you.<\/p>\n Our nonprofit newsroom provides award-winning climate coverage free of charge and advertising. We rely on donations from readers like you to keep going. Please donate now to support our work.<\/p>\n
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