Former Cuban leader Fidel Castro warned of many dangers currently threatening the planet and the humanity such as mass destructive weapons and climate change.

"For the first time, the human species, in a globalized world full of contradictions, have created the ability to destroy themselves," Castro said in an article released on Monday.

The leader mentioned the "weapons of unprecedented cruelty, such as bacteriological and chemical weapons, napalm and white phosphorus, which are used against civilians and enjoy total impunity."

He said that no place in the depths of the earth or in the seas could get outside the scope of the current means of war.

"The greatest danger comes from the decision of leaders with such powers and their decisions, and the mistakes and madness, so common in human nature, can lead to incredible disasters," he said.

He added that even the mankind could get rid of those risks, "there is still a greater, or at least more inevitable (risk): climate change."

"It is absolutely unthinkable that 9 billion human beings who live in the world in 2050 could survive such a catastrophe," he said.