By 2040, the world will be noticeably warmer, more urban, more automated, and more medically advanced than it is today. That’s not speculation. It’s the trajectory drawn by current data from climate scientists, demographers, economists, and technologists. Some of these changes are already locked in by physics and population trends. Others depend on choices governments and industries make in the next few years.
A Warmer Planet With Real Consequences
If the current rate of warming continues, global temperatures will reach 1.5°C above pre-industrial levels around 2040. The IPCC considers that a critical threshold. Human activity had already warmed the planet by about 1°C by 2017, so the remaining half-degree buffer is shrinking fast.
At 1.5°C, the risks are greater than what we experience today but meaningfully lower than at 2°C. The difference between those two numbers sounds small but translates into hundreds of millions of people exposed to severe heat, greater coral reef die-off, more intense flooding in coastal cities, and sharper drops in crop yields in tropical regions. Sea levels will continue rising regardless of what emissions policies are enacted between now and then, because the ocean absorbs heat slowly and ice sheets take decades to respond. Coastal infrastructure built today will face conditions it wasn’t designed for.
More People, Mostly in Cities
The global population will still be growing in 2040, on its way toward a projected peak of roughly 10.3 billion in the mid-2080s. By the late 2040s, the global fertility rate is expected to fall to 2.1, which is the replacement level where population growth essentially stalls. That decline is already well underway in East Asia, Europe, and the Americas.
The bigger shift is where people live. The urbanization trend that defined the 20th century will accelerate. More than two-thirds of the world’s population is expected to live in cities by 2040, up from about 56% today. That means massive infrastructure demands: housing, transit, water systems, and power grids for megacities that are still expanding, particularly in sub-Saharan Africa and South Asia. Rural communities in many regions will continue to shrink, with knock-on effects for agriculture and local economies.
AI in the Workplace
Artificial intelligence will reshape work more dramatically than any technology since the internet. McKinsey forecasts that AI-driven automation could eventually handle as much as 70% of current worker hours, with the biggest disruption hitting knowledge workers rather than manual laborers. Decision-making, collaboration, customer service, marketing, software engineering, and research and development are the areas where generative AI is expected to deliver the most value.
That doesn’t mean 70% of jobs disappear. It means the composition of most jobs changes. A marketing professional in 2040 will likely spend far less time drafting copy and far more time directing AI tools and refining strategy. A software engineer will describe what they want in plain language and review what the machine produces. The productivity gains could boost U.S. output by about 0.7% annually through 2040, which compounds into a significant economic shift over 15 years.
The uncomfortable side of this: workers whose roles are primarily about synthesizing information, writing reports, or handling routine customer interactions face real displacement pressure. Retraining at scale is the obvious answer, but no country has yet proven it can do that smoothly during a fast-moving technological transition.
The Race Toward General AI
A survey of more than 8,500 AI researchers, entrepreneurs, and technologists found that most experts consider the development of artificial general intelligence (AGI) inevitable, with a consensus timeline centering around 2040. Entrepreneurs were more aggressive, predicting 2030. AGI refers to AI systems that can perform any intellectual task a human can, not just narrow, specialized functions like image recognition or language generation.
Whether AGI actually arrives by 2040 is genuinely uncertain. But the path toward it will produce increasingly capable systems that blur the line. By 2040, quantum computing is expected to be transitioning from early commercial applications into what Boston Consulting Group calls “broad quantum advantage,” where quantum machines outperform classical computers across a wide range of real-world problems. Full fault-tolerant quantum computing, the kind that could revolutionize drug discovery, logistics, and cryptography, is projected to arrive after 2040. BCG estimates quantum computing alone could generate up to $850 billion in economic value by that year.
Longer Lives, Different Diseases
Global life expectancy is projected to increase by about 4.4 years for both men and women by 2040, according to a large forecasting study published in The Lancet. In the best-case scenario, where countries invest heavily in public health, the gain could be as high as 7 to 8 years. In a worst-case scenario of stalled progress, life expectancy could flatline or even dip slightly.
The diseases that kill people will shift. Non-communicable diseases like heart disease, cancer, diabetes, and chronic lung conditions are forecast to account for about 67% of all years of life lost globally by 2040. That’s a growing share compared to today, driven by aging populations, rising obesity, and the success of reducing deaths from infectious diseases. The exception is sub-Saharan Africa, where infectious diseases, maternal complications, and malnutrition are still projected to cause more than half of premature deaths.
Gene editing is one reason for cautious optimism. CRISPR-based therapies have already reached clinical trials for sickle cell disease, beta-thalassemia, and a form of childhood blindness called Leber congenital amaurosis. Researchers have also demonstrated gene correction in human embryos for a mutation that causes a dangerous thickening of the heart muscle. By 2040, gene therapy is expected to be a routine treatment option for a growing list of single-gene disorders, including Duchenne muscular dystrophy and certain inherited liver diseases. The bigger question is whether these therapies will be accessible beyond wealthy countries.
Feeding 9 Billion People
Global food production needs to increase by roughly 47% from 2011 levels to feed an estimated 9.7 billion people by 2050. Under a high-population scenario, that figure jumps to 61%. The 2040 midpoint of that trajectory means agriculture is under mounting pressure throughout the next 15 years, even as climate change makes farming harder in many of the regions that need it most.
Diets are shifting, too. As incomes rise in developing countries, people eat more meat, dairy, and processed food. That drives demand for animal feed crops, which require far more land and water per calorie than grains or vegetables eaten directly. The math is tight: producing enough food is technically possible with current technology and projected yield improvements, but it requires reducing food waste (currently about a third of all food produced is lost), expanding irrigation sustainably, and adopting precision agriculture techniques that use data and automation to optimize every acre.
Water scarcity compounds the challenge. Many of the fastest-growing populations are in regions where freshwater supplies are already strained. Competition between agricultural, industrial, and residential water use will intensify, particularly in North Africa, the Middle East, and parts of South Asia.
What Ties It All Together
The world of 2040 isn’t a single story. It’s a collision of trends moving at different speeds. Climate change is locked in by physics and moves slowly but relentlessly. AI and automation move fast but unevenly across industries and countries. Demographic shifts are predictable decades in advance but play out differently in aging Japan versus young Nigeria. Medical advances could be transformative for those who can access them and irrelevant for those who can’t.
The clearest takeaway from the data is that 2040 will be a world of sharper contrasts. Wealthier nations will have older populations, longer lifespans, AI-augmented economies, and gene therapies for diseases that were once death sentences. Lower-income nations will still be fighting infectious disease, building basic infrastructure, and coping with the worst effects of a warming climate they did the least to cause. The global challenge of the next 15 years isn’t just technological progress. It’s whether that progress reaches the people who need it most.