Understanding the UNFCCC Entry into Force Date

The United Nations Framework Convention on Climate Change (UNFCCC) is an international environmental treaty adopted to combat "dangerous human interference with the climate system". It was signed by a large number of countries at the Earth Summit in Rio de Janeiro in 1992.

When did the UNFCCC officially begin?

While the UNFCCC was signed in 1992, international treaties like this do not become legally binding immediately upon signing. They usually require ratification by a certain number of countries before they officially "enter into force".

For the UNFCCC, the requirement was ratification by 50 countries. Once this threshold was met, the Convention entered into force.

Let's look at the specific date the UNFCCC entered into force:

• The UNFCCC was opened for signature on 4 June 1992.
• It received its 50th ratification on 21 December 1993.
• According to its provisions, the Convention entered into force 90 days after the 50th ratification.

Calculating 90 days after 21 December 1993:

• Days remaining in December 1993: 31 - 21 = 10 days
• Days in January 1994: 31 days
• Days in February 1994: 28 days (1994 was not a leap year)
• Total days so far: 10 + 31 + 28 = 69 days
• Remaining days needed: 90 - 69 = 21 days
• Counting 21 days into March 1994 gives us 21 March 1994.

Therefore, the UNFCCC officially entered into force on 21 March 1994.

Examining the Options for the UNFCCC Entry into Force

The options provided are dates around the signing and entry into force period:

• 10 May, 1992
• 5 June, 1992
• 5 June, 1994
• 21 March, 1994

Based on the ratification process and the 90-day rule after the 50th ratification (which happened in December 1993), the date the UNFCCC entered into force is 21 March 1994.

The dates in 1992 relate to the signing or adoption of the Convention, not its legal entry into force. The date 5 June 1994 is after the actual entry into force date.

Thus, the correct date for the UNFCCC entering into force is 21 March 1994.