A mathematician at the University of Barcelona estimated that there are 13 percent chances that mankind will not live to see the end of the 21st century.
Doctor Fergus Simson, the mathematician at the Cosmic Sciences Institute in Barcelona, said that there are 0.2 percent chances that 'global catastrophes' may occur any year during the 21st century.
This calculation is based on the argument that claims that it is possible to predict the number of future members of the human species on the basis of the total number of humans born until now.
'Our main conclusion is that the annual risk of a global catastrophe now exceeds 0.2 percent', wrote Dr. Simson in an academic paper called 'Apocalypse Now' in National Geographic.
According to doctor Simson's calculations, about 100 billion people has already been born, and about as many will be born in the future, before the human race dies out.
He estimated that there is a chance of 13 percent, that mankind won't live to see the end of the 21st century.
This is even more optimistic conclusion than in the previous studies, in which the British astronomer Martin Reese suggested that there is a probability of 50 percent that the human race will become extinct until 2100.
Simson's hypothesis is followed by several studies that warn of apocalyptic effects of climate changes.
New research published in magazine 'Science Advances' warns that if people continue to use large amounts of fossil fuels, the planet Earth could be on the way of global warming for more than seven degrees Celsius, which would have a disastrous effect on the human population.
Researchers found that the climate can be much more sensitive to the greenhouse effect than it was previously thought, and that would really mark the end of efforts to prevent dangerous global warming.