“By far the single greatest danger facing humankind — in fact, all living beings on our planet — is the threat of nuclear destruction.” — Dalai Lama
And for good reason. There are enough nuclear warheads in the world to destroy civilization many times over and destroy most life on earth. – That is someting we really do not need.
Read more facts and myths about nuclear weapons. Look also at the website of ICAN (The International Campaign to Abolish Nuclear Weapons), it has a myriad of relevant information, also country by country.
Check all the important days of the world as declared by UN.