Understanding the Stockholm Convention on POPs

The question asks about the year the Stockholm Convention on Persistent Organic Pollutants (POPs) was signed. This is an important international environmental treaty aimed at protecting human health and the environment from harmful persistent organic pollutants.

Persistent Organic Pollutants (POPs) are chemical substances that persist in the environment, bioaccumulate in living organisms, and pose a risk to human health and the environment. Due to their characteristics, POPs can be transported across international boundaries far from their sources, even to regions where they have never been used or produced.

Recognizing the need for global action to address these harmful chemicals, the international community negotiated the Stockholm Convention.

The key event mentioned in the question is the signing of the convention. Let's look at the history:

• Negotiations for the convention concluded in December 2000.
• The Convention was adopted and opened for signature at a Conference of Plenipotentiaries held from 21 to 23 May 2001 in Stockholm, Sweden.
• It entered into force on 17 May 2004.

Therefore, the year the Stockholm Convention on Persistent Organic Pollutants (POPs) was signed is 2001.

Analyzing the Options

Let's consider the given options based on our understanding of the Stockholm Convention's history:

• 2000: Negotiations concluded in 2000, but the convention was not signed in this year.
• 2001: The convention was adopted and opened for signature in 2001 at a conference in Stockholm. This aligns with the signing event.
• 1998: This year is too early; negotiations started later.
• 1999: This year is also too early in the negotiation process.

Based on the historical timeline, the correct year for the signing of the Stockholm Convention on POPs is 2001.

Confirmation of the Stockholm Convention Signing Year

The Stockholm Convention on Persistent Organic Pollutants was indeed adopted and opened for signature in May 2001. This marks the official signing phase where countries could commit to becoming parties to the convention.

Revision Table: Stockholm Convention on POPs

Additional Information about Persistent Organic Pollutants (POPs)

POPs have specific characteristics that make them particularly problematic:

• Persistence: They resist degradation in the environment (chemical, biological, photolytic).
• Bioaccumulation: They accumulate in the fatty tissues of living organisms, increasing in concentration as they move up the food chain.
• Long-range transport: They can travel long distances through air and water, affecting regions far from their release source.
• Toxicity: They can cause a range of adverse health effects in humans and wildlife.

The Stockholm Convention initially listed 12 chemicals, often referred to as the "dirty dozen," for elimination or restriction. More chemicals have been added to the list over time.

Examples of initial POPs included pesticides like DDT, industrial chemicals like PCBs, and unintended by-products like dioxins and furans.