World leaders have arrived at Paris to take part in the 2015 United Nations Climate Change Conference and decide how to tackle global warming. It is believed that a topic ‘two degrees Celsius’ will be discussed in this week’s climate change talks in Paris.

A number of climate scientists have experts argued that a rise of two degrees Celsius in earth’s global air temperature will be catastrophic for all living beings. But many other researchers think the rise of two degrees Celsius is result of weak studies. They are convinced that the climate change is real, but the two degrees is an impractical spur to policy action.

Mark Maslin, climatology professor from University College London, said, “It emerged from a political agenda, not a scientific analysis. It’s not a sensible, rational target because the models give you a range of possibilities, not a single answer”.

Two degrees limit has become a topic of discussion among climate scientists. The United Nations Intergovernmental Panel on Climate Change has published exhaustive reports, which are considered as trustworthy analysis. But, not a single report has mentioned the two degrees limit.

Still, a number of climate scientists and experts favor the two-degree goal. They think it could give policy makers a target in the battle against climate change. Most climatologists are convinced that global warming is happening, and humans are responsible for that. But what temperature could be dangerous is a matter of debate.