Causing intense horror, UN climate chief Christiana Figueres said on Monday that the world has entered a "new danger zone" having a record level of Earth-warming carbon dioxide in the atmosphere.

While furthering with the fact, she expressed in a statement urging policy action adding that with a CO2 level of 400 parts per million (ppm) announced last week, the highest in human history, the world “crossed an historic threshold and entered a new danger zone.

According to the experts, the level measured by US monitors has not been seen in three to five million years that's a time when Earth’s temperatures were several degrees Celsius warmer and the sea level was 20 to 40 meters (22 to 44 yards) higher than today.

The 400 ppm threshold had been expected to be fractured for some time, but campaigners say it should nevertheless serve as a wake-up call in efforts to curb greenhouse gas emissions through fossil fuel use.

Even Figueres said that the world must wake up and take note of what this means for human security, human welfare and economic development.

As a horrific factor at the conclusion that in the face of clear and present danger, we need a policy response which truly rises to the challenge.

It's a critical threat to humankind therefore the action needs to be spontaneous!

Image resource:  Earth-warming carbon dioxide

(AW:Samrat Biswas)