The Organization for Economic Cooperation and Development (OECD) published its Environmental Outlook to 2050 report, and the predictions are grim.
According to the OECD, global greenhouse gas emissions could rise by a staggering 50% by 2050 unless more ambitious climate policies curb them, as fossil fuels continue to dominate the energy mix.
"Unless the global energy mix changes, fossil fuels will supply about 85% of energy demand in 2050, implying a 50% increase in greenhouse gas emissions and worsening urban air pollution," the OECD said in a statement.
The global economy in 2050 will be four times larger than it is today and the world will use around 80% more energy, the report said.
But the global energy mix is not predicted to be very different from that of today: Fossil fuels such as oil, coal and gas will make up 85% of energy sources, while renewable energy sources, including biofuels, are forecast to make up 10% and nuclear energy will make up the rest.
This, however, will help drive up the average global temperature by 3 to 6 degrees Celsius by 2100 - exceeding the internationally agreed warming limit of within 2 degrees.