The report, by the UN's Intergovernmental Panel on Climate Change (IPCC) claims climate change is already having an impact across the world in areas ranging from human health to agriculture and wildlife.
Rising temperatures will increasingly threaten security, health and food supplies, and exacerbate poverty and damage species and habitats, the report also warned.
Rising temperatures will increasingly threaten security, health and food supplies, and exacerbate poverty and damage species and habitats, the report also warned.
'Man-made'
The world is in "an era of man-made climate change" and has already seen impacts of global warming on every continent and across the oceans.
Vicente Barros, co-chair of the IPCC study on climate change impacts, vulnerabilities and adaptation, from the University of Buenos Aires, Argentina said: "We live in an era of man-made climate change.
"In many cases, we are not prepared for the climate-related risks that we already face. Investments in better preparation can pay dividends both for the present and for the future."
We live in an era of man-made climate change- IPCC's Vicente Barros
The world has seen changes in recent decades to water resources as a result of melting glaciers and differences in rainfall, and reductions in wheat and maize yields.
There has been a decrease in the number of people dying from the cold but an increase in heat-related deaths in some areas, such as England and Wales, the report suggested.
Species including fish stocks are shifting their ranges, coral reefs are being damaged and wildfires are becoming more frequent.
There has been a decrease in the number of people dying from the cold but an increase in heat-related deaths in some areas, such as England and Wales, the report suggested.
Species including fish stocks are shifting their ranges, coral reefs are being damaged and wildfires are becoming more frequent.
'Increased risk of flooding'
The report on the impacts of climate change said rising temperatures are expected to lead to increased risk of flooding, more droughts and heatwaves, drive species extinct and cause forests to die in many regions of the world.
Food security will be hit by reduced yields in the major crops of wheat, rice and maize, while climate change will also exacerbate existing health problems, and lead to more heat wave-related deaths, malnutrition and disease.
Food security will be hit by reduced yields in the major crops of wheat, rice and maize, while climate change will also exacerbate existing health problems, and lead to more heat wave-related deaths, malnutrition and disease.
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