Global mean temperature at the Earth's surface is set to reach one degree Celsius above pre-industrial levels this year.
The data was released by Britain's Met Office on Monday.
Director of the Met Office Hadley Center, Stephen Belcher, said there were similar natural events in the past, but it's clear that this time it is human influence driving the climate into such uncharted territory.
Early indications suggest 2016 will be similarly warm and it is expected that warming will continue in the longer term.
Peter Stott, who leads the Climate Monitoring and Attribution team in the Met Office, said people will see more and more years passing the one degree marker and that eventually it will become the norm.
Limiting the rise in Earth's temperatures to below two degrees Celsius above pre-industrial levels is the core goal of the United Nations' upcoming climate summit in Paris.
