The Japanese government's recent decision to discharge radioactive-contaminated water from the Fukushima Atomic Power Plant into the sea has prompted increasing protest from the international community.

Against this backdrop, a colloidal substance suspected to be radioactive waste was spotted near the plant and high-concentration radioactivity was detected in the drainage canal nearby, triggering off another round of international controversy.

An investigation proved the colloidal substance to be radioactive waste that leaked from the plant, raising suspicion that some of them might have been washed away to the sea by rainwater.

This notwithstanding, Japan, with no intent to withdraw the decision, argues the recent leakage has made no adverse impact on environment.

Discharging water contaminated with nuclear materials to the sea, treasure common to humankind and the origin of activities of all life, is a crime threatening the existence of all mankind beyond a country and a region.

Lots of radioactive materials that leaked after the 2011 accident in the plant have seriously impinged on the world ecological environment as evidenced by the detection of radioactive materials not only on the Japanese coast but on the Pacific coast in North America.

According to an estimation by the Tokyo Electricity Company published by the April 21 2011 issue of Tokyo Shimbun, 20 000 times more radioactive materials than the tolerance limits for discharging by the power plant for one year found their way into the sea in just six days between April 1 and 6.

Afterwards, there was a chain of accidents, big or small, related to high-concentration contaminated water leakage from the plant, namely the December 2011 leakage of 45 tons of contaminated water containing radioactive materials which are one million times more than the tolerance limits, the August and December 2013 leakage of 500 tons of contaminated water which is over 2.66 million times more than the tolerance limits, and the February 2014 leakage of about 100 tons of contaminated water. This has generated worldwide fear about the Fukushima nuclear contaminated water.

Despite the serious situation of natural leakage of contaminated water caused by the incident, the Japanese government intentionally discharged 11 500 tons of radioactive-contaminated water into the sea, calling it "low-concentration contaminated water" though it was 100 times higher than the internationally set tolerance limits.

As this drew a barrage of harsh criticism from the international community, Japan announced it would store the water after purification. But behind the scene, Japan plotted to continue the release of the stored contaminated water by taking advantage of a Japanese holding the post of the director general of the International Atomic Energy Agency and has now reached the point of making the impudent decision which makes everyone hardly believe their ears.

The discharge of radioactive-contaminated water into sea is an international issue related to the existence of humankind, not just an internal affair of Japan.

Japan is now deeply involved in all kinds of crimes related to the destruction of ecological environment like internationally banned whaling for food and ivory smuggling, as well as the release of high-concentration radioactive-contaminated water into the sea.

All facts show Japan is a dangerous criminal state destroying environment which takes no heed of international law and health and security of mankind to serve its own selfish interests.

It says that the water retained by it is "treated water" that had gone through poly-nuclear clearing equipment and it is "safe" and "scientifically-tested", but world justice and conscience will not be taken in.

Japan must promptly withdraw the decision, instead of engaging in trickery by avoiding the world's attention.